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Thread: Reboot drops to grub shell after kernel update

  1. #1
    Join Date
    May 2005
    Location
    St. John's, NL
    Beans
    74

    Question Reboot drops to grub shell after kernel update

    I've previously had this posted on askubuntu , but thought I found a solution that ended up not lasting. After an update with the kernel, on the next reboot, my grub just drops to the grub shell. This has happened numerous times in the past, which I only fixed by re-installing. I'm sick of re-installing, and want to find a solution to this issue. The latest time this has happened was today when my system updated to 5.0.0-17-generic kernel. I'm running Kubuntu 19.04 with all updates up to today, June 19th. Some of the information below I am copying and pasting as the info has not changed.

    Hardware:

    • AMD Ryzen 2600X
    • 16GB Ram
    • Asus B450 Motherboard
    • 1x Samsung Evo 500 GB SSD (Primary drive)
    • 1x Seagate 1TB HDD (Storage Drive)
    • No other OS's


    Manually entering the following at the grub screen allows my system to boot (obfuscated the UUID) and function normally:

    Code:
    > insmod gzio
    > insmod part_gpt
    > insmod btrfs
    > linux /@/boot/vmlinuz-5.0.0-15-generic root=UUID=0000000-000-000 ro rootflags=subvol=@ quiet splash
    > initrd /@/boot/initrd.img-5.0.0-15-generic
    > boot
    But, this is obviously annoying to have to do every reboot. I've checked my configuration files, everything looks fine, but it just seems like grub cannot read the configuration files for some reason.

    The UUID for my primary drive has been obfuscated below, but I did verify that it is accurate in my configuration files.

    /etc/fstab:

    Code:
    # /etc/fstab: static file system information.
    #
    # Use 'blkid' to print the universally unique identifier for a
    # device; this may be used with UUID= as a more robust way to name devices
    # that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point>   <type>  <options>       <dump>  <pass>
    # / was on /dev/sda2 during installation
    # /boot/efi was on /dev/sda1 during installation
    UUID=4DD8-BE9A  /boot/efi       vfat    umask=0077      0       1
    # /home was on /dev/sda2 during installation
    /swapfile                                 none            swap    sw              0       0
    
    UUID=0000000-000-000 /               btrfs   rw,relatime,compress=zstd,ssd,discard,space_cache,subvol=@ 0       1
    UUID=0000000-000-000 /home           btrfs   rw,relatime,compress=zstd,ssd,discard,space_cache,subvol=@home 0       2
    UUID=0000000-000-000 /var           btrfs   rw,relatime,compress=zstd,ssd,discard,space_cache,subvol=@var 0       2
    
    UUID=1111111-111-111 /mnt/storage        btrfs   rw,relatime,compress=zstd,ssd,discard,space_cache 0 2
    /boot/grub/grub.cfg:

    Code:
    #
    # DO NOT EDIT THIS FILE
    #
    # It is automatically generated by grub-mkconfig using templates
    # from /etc/grub.d and settings from /etc/default/grub
    #
    
    ### BEGIN /etc/grub.d/00_header ###
    if [ -s $prefix/grubenv ]; then
      set have_grubenv=true
      load_env
    fi
    if [ "${initrdfail}" = 2 ]; then
       set initrdfail=
    elif [ "${initrdfail}" = 1 ]; then
       set next_entry="${prev_entry}"
       set prev_entry=
       save_env prev_entry
       if [ "${next_entry}" ]; then
          set initrdfail=2
       fi
    fi
    if [ "${next_entry}" ] ; then
       set default="${next_entry}"
       set next_entry=
       save_env next_entry
       set boot_once=true
    else
       set default="0"
    fi
    
    if [ x"${feature_menuentry_id}" = xy ]; then
      menuentry_id_option="--id"
    else
      menuentry_id_option=""
    fi
    
    export menuentry_id_option
    
    if [ "${prev_saved_entry}" ]; then
      set saved_entry="${prev_saved_entry}"
      save_env saved_entry
      set prev_saved_entry=
      save_env prev_saved_entry
      set boot_once=true
    fi
    
    function savedefault {
      if [ -z "${boot_once}" ]; then
        saved_entry="${chosen}"
        save_env saved_entry
      fi
    }
    function initrdfail {
        if [ -n "${have_grubenv}" ]; then if [ -n "${partuuid}" ]; then
          if [ -z "${initrdfail}" ]; then
            set initrdfail=1
            if [ -n "${boot_once}" ]; then
              set prev_entry="${default}"
              save_env prev_entry
            fi
          fi
          save_env initrdfail
        fi; fi
    }
    function recordfail {
      set recordfail=1
      # GRUB lacks write support for btrfs, so recordfail support is disabled.
    }
    function load_video {
      if [ x$feature_all_video_module = xy ]; then
        insmod all_video
      else
        insmod efi_gop
        insmod efi_uga
        insmod ieee1275_fb
        insmod vbe
        insmod vga
        insmod video_bochs
        insmod video_cirrus
      fi
    }
    
    if [ x$feature_default_font_path = xy ] ; then
       font=unicode
    else
    insmod part_gpt
    insmod btrfs
    set root='hd0,gpt2'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
    else
      search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
    fi
        font="/@/usr/share/grub/unicode.pf2"
    fi
    
    if loadfont $font ; then
      set gfxmode=auto
      load_video
      insmod gfxterm
      set locale_dir=$prefix/locale
      set lang=en_CA
      insmod gettext
    fi
    terminal_output gfxterm
    if [ "${recordfail}" = 1 ] ; then
      set timeout=30
    else
      if [ x$feature_timeout_style = xy ] ; then
        set timeout_style=menu
        set timeout=1
      # Fallback normal timeout code in case the timeout_style feature is
      # unavailable.
      else
        set timeout=1
      fi
    fi
    if [ $grub_platform = efi ]; then
      set timeout=30
      if [ x$feature_timeout_style = xy ] ; then
        set timeout_style=menu
      fi
    fi
    ### END /etc/grub.d/00_header ###
    
    ### BEGIN /etc/grub.d/05_debian_theme ###
    set menu_color_normal=white/black
    set menu_color_highlight=black/light-gray
    #set_background_image "images/tile.png";
    
    set menu_color_normal=white/black
    set menu_color_highlight=black/light-gray
    if background_color 0,0,0; then
      clear
    fi
    ### END /etc/grub.d/05_debian_theme ###
    
    ### BEGIN /etc/grub.d/10_linux ###
    function gfxmode {
            set gfxpayload="${1}"
            if [ "${1}" = "keep" ]; then
                    set vt_handoff=vt.handoff=1
            else
                    set vt_handoff=
            fi
    }
    if [ "${recordfail}" != 1 ]; then
      if [ -e ${prefix}/gfxblacklist.txt ]; then
        if hwmatch ${prefix}/gfxblacklist.txt 3; then
          if [ ${match} = 0 ]; then
            set linux_gfx_mode=keep
          else
            set linux_gfx_mode=text
          fi
        else
          set linux_gfx_mode=text
        fi
      else
        set linux_gfx_mode=keep
      fi
    else
      set linux_gfx_mode=text
    fi
    export linux_gfx_mode
    menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-698b5d59-9862-401e-9491-a80ff3ff1090' {
            recordfail
            load_video
            gfxmode $linux_gfx_mode
            insmod gzio
            if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
            insmod part_gpt
            insmod btrfs
            set root='hd0,gpt2'
            if [ x$feature_platform_search_hint = xy ]; then
              search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
            else
              search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
            fi
            linux   /@/boot/vmlinuz-5.0.0-17-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro rootflags=subvol=@  quiet splash $vt_handoff
            initrd  /@/boot/initrd.img-5.0.0-17-generic
    }
    submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-698b5d59-9862-401e-9491-a80ff3ff1090' {
            menuentry 'Ubuntu, with Linux 5.0.0-17-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.0.0-17-generic-advanced-698b5d59-9862-401e-9491-a80ff3ff1090' {
                    recordfail
                    load_video
                    gfxmode $linux_gfx_mode
                    insmod gzio
                    if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                    insmod part_gpt
                    insmod btrfs
                    set root='hd0,gpt2'
                    if [ x$feature_platform_search_hint = xy ]; then
                      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
                    else
                      search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
                    fi
                    echo    'Loading Linux 5.0.0-17-generic ...'
                    linux   /@/boot/vmlinuz-5.0.0-17-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro rootflags=subvol=@  quiet splash $vt_handoff
                    echo    'Loading initial ramdisk ...'
                    initrd  /@/boot/initrd.img-5.0.0-17-generic
            }
            menuentry 'Ubuntu, with Linux 5.0.0-17-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.0.0-17-generic-recovery-698b5d59-9862-401e-9491-a80ff3ff1090' {
                    recordfail
                    load_video
                    insmod gzio
                    if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                    insmod part_gpt
                    insmod btrfs
                    set root='hd0,gpt2'
                    if [ x$feature_platform_search_hint = xy ]; then
                      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
                    else
                      search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
                    fi
                    echo    'Loading Linux 5.0.0-17-generic ...'
                    linux   /@/boot/vmlinuz-5.0.0-17-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro recovery nomodeset rootflags=subvol=@ 
                    echo    'Loading initial ramdisk ...'
                    initrd  /@/boot/initrd.img-5.0.0-17-generic
            }
            menuentry 'Ubuntu, with Linux 5.0.0-16-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.0.0-16-generic-advanced-698b5d59-9862-401e-9491-a80ff3ff1090' {
                    recordfail
                    load_video
                    gfxmode $linux_gfx_mode
                    insmod gzio
                    if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                    insmod part_gpt
                    insmod btrfs
                    set root='hd0,gpt2'
                    if [ x$feature_platform_search_hint = xy ]; then
                      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
                    else
                      search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
                    fi
                    echo    'Loading Linux 5.0.0-16-generic ...'
                    linux   /@/boot/vmlinuz-5.0.0-16-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro rootflags=subvol=@  quiet splash $vt_handoff
                    echo    'Loading initial ramdisk ...'
                    initrd  /@/boot/initrd.img-5.0.0-16-generic
            }
            menuentry 'Ubuntu, with Linux 5.0.0-16-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.0.0-16-generic-recovery-698b5d59-9862-401e-9491-a80ff3ff1090' {
                    recordfail
                    load_video
                    insmod gzio
                    if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                    insmod part_gpt
                    insmod btrfs
                    set root='hd0,gpt2'
                    if [ x$feature_platform_search_hint = xy ]; then
                      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
                    else
                      search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
                    fi
                    echo    'Loading Linux 5.0.0-16-generic ...'
                    linux   /@/boot/vmlinuz-5.0.0-16-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro recovery nomodeset rootflags=subvol=@ 
                    echo    'Loading initial ramdisk ...'
                    initrd  /@/boot/initrd.img-5.0.0-16-generic
            }
    }
    
    ### END /etc/grub.d/10_linux ###
    
    ### BEGIN /etc/grub.d/20_linux_xen ###
    
    ### END /etc/grub.d/20_linux_xen ###
    
    ### BEGIN /etc/grub.d/20_memtest86+ ###
    ### END /etc/grub.d/20_memtest86+ ###
    
    ### BEGIN /etc/grub.d/30_os-prober ###
    ### END /etc/grub.d/30_os-prober ###
    
    ### BEGIN /etc/grub.d/30_uefi-firmware ###
    menuentry 'System setup' $menuentry_id_option 'uefi-firmware' {
            fwsetup
    }
    ### END /etc/grub.d/30_uefi-firmware ###
    
    ### BEGIN /etc/grub.d/40_custom ###
    # This file provides an easy way to add custom menu entries.  Simply type the
    # menu entries you want to add after this comment.  Be careful not to change
    # the 'exec tail' line above.
    ### END /etc/grub.d/40_custom ###
    
    ### BEGIN /etc/grub.d/41_custom ###
    if [ -f  ${config_directory}/custom.cfg ]; then
      source ${config_directory}/custom.cfg
    elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
      source $prefix/custom.cfg;
    fi
    ### END /etc/grub.d/41_custom ###
    /etc/default/grub:

    Code:
    # If you change this file, run 'update-grub' afterwards to update
    # /boot/grub/grub.cfg.
    # For full documentation of the options in this file, see:
    #   info -f grub -n 'Simple configuration'
    
    GRUB_DEFAULT=0
    GRUB_TIMEOUT=1
    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX=""
    
    # Uncomment to enable BadRAM filtering, modify to suit your needs
    # This works with Linux (no patch required) and with any kernel that obtains
    # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
    #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
    
    # Uncomment to disable graphical terminal (grub-pc only)
    #GRUB_TERMINAL=console
    
    # The resolution used on graphical terminal
    # note that you can use only modes which your graphic card supports via VBE
    # you can see them in real GRUB with the command `vbeinfo'
    #GRUB_GFXMODE=640x480
    
    # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
    #GRUB_DISABLE_LINUX_UUID=true
    
    # Uncomment to disable generation of recovery mode menu entries
    #GRUB_DISABLE_RECOVERY="true"
    
    # Uncomment to get a beep at grub start
    #GRUB_INIT_TUNE="480 440 1"
    Nothing in /etc/grub/grub.d except empty (commented out) init-select.cfg

    Output of update-grub:

    Code:
    Sourcing file `/etc/default/grub'
    Sourcing file `/etc/default/grub.d/init-select.cfg'
    Generating grub configuration file ...
    Found linux image: /boot/vmlinuz-5.0.0-17-generic
    Found initrd image: /boot/initrd.img-5.0.0-17-generic
    Found linux image: /boot/vmlinuz-5.0.0-16-generic
    Found initrd image: /boot/initrd.img-5.0.0-16-generic
    Adding boot menu entry for EFI firmware configuration
    done
    output of fdisk:

    Code:
    ~# fdisk -l
    Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
    Disk model: Samsung SSD 850 
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: gpt
    Disk identifier: 222222222-2222-2222222
    
    Device      Start       End   Sectors   Size Type
    /dev/sda1    2048    999423    997376   487M EFI System
    /dev/sda2  999424 976771071 975771648 465.3G Linux filesystem
    
    
    Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
    Disk model: ST31000524AS    
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: gpt
    Disk identifier: 33333333333-3333-3333333
    
    Device     Start        End    Sectors   Size Type
    /dev/sdb1   2048 1953519615 1953517568 931.5G Linux filesystem
    Contents of /boot/efi:

    Code:
    # find /boot/efi
    /boot/efi
    /boot/efi/EFI
    /boot/efi/EFI/ubuntu
    /boot/efi/EFI/ubuntu/grubx64.efi
    /boot/efi/EFI/ubuntu/shimx64.efi
    /boot/efi/EFI/ubuntu/mmx64.efi
    /boot/efi/EFI/ubuntu/BOOTX64.CSV
    /boot/efi/EFI/ubuntu/grub.cfg
    /boot/efi/EFI/BOOT
    /boot/efi/EFI/BOOT/BOOTX64.EFI
    /boot/efi/EFI/BOOT/fbx64.efi
    /boot/efi/EFI/BOOT/mmx64.efi
    Output of btrfs subvolume (though, this issue has plagued me since before I used btrfs):

    Code:
    :~$ sudo btrfs subvolume list /
    ID 256 gen 163835 top level 5 path @
    ID 258 gen 163835 top level 5 path @home
    ID 268 gen 163835 top level 5 path @var
    Any suggestions from anyone on what the issue could be, or what I could do to fix it? Other than using btrfs nowadays which this issue preceded, I don't do anything out of the ordinary that I know for. Any help would be greatly appreciated.

  2. #2
    Join Date
    Jun 2009
    Location
    SW Forida
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Reboot drops to grub shell after kernel update

    I suggest adding btrfs to title as not many know nor use BTRFS file system.
    It has unique issues.

    You may want to also run Boot-Repair's summary report as it gives more detail than the listings you posted. Not sure if it even works with BTRFS.
    May be best to see details, use ppa version with your live installer (2nd option) or any working install, not older Boot-Repair ISO:
    Please copy & paste link to the Boot-info summary report ( do not post report), the auto fix sometimes can create more issues.
    https://help.ubuntu.com/community/Boot-Repair &
    https://sourceforge.net/p/boot-repair/home/Home/
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  3. #3
    Join Date
    May 2005
    Location
    St. John's, NL
    Beans
    74

    Question Re: Reboot drops to grub shell after kernel update (btrfs filesystem)

    Quote Originally Posted by oldfred View Post
    I suggest adding btrfs to title as not many know nor use BTRFS file system.
    It has unique issues.

    You may want to also run Boot-Repair's summary report as it gives more detail than the listings you posted. Not sure if it even works with BTRFS.
    May be best to see details, use ppa version with your live installer (2nd option) or any working install, not older Boot-Repair ISO:
    Please copy & paste link to the Boot-info summary report ( do not post report), the auto fix sometimes can create more issues.
    https://help.ubuntu.com/community/Boot-Repair &
    https://sourceforge.net/p/boot-repair/home/Home/
    Thank you for your response. As I did say in my original post, this issue has existed for me since before I used btrfs, it's only one of the more recent re-installs that I decided to set my system up using that filesystem. Where it was a pre-existing issue, I didn't want to throw off the focus by mentioning btrfs in the title, but upon your suggestion, I have updated it.

    As per your suggestion, here is the output from boot-repair summary report (some lines have been edited due to visible passwords in fstab):

    Code:
     Boot Info Script 8f991e4 + Boot-Repair extra info      [Boot-Info 25oct2017]
    
    
    ============================= Boot Info Summary: ===============================
    
     => No boot loader is installed in the MBR of /dev/sda.
     => No boot loader is installed in the MBR of /dev/sdb.
    
    sda1: __________________________________________________________________________
    
        File system:       vfat
        Boot sector type:  FAT32
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  
        Boot files:        /EFI/ubuntu/grub.cfg /EFI/BOOT/fbx64.efi 
                           /EFI/BOOT/mmx64.efi /EFI/GRUB/grubx64.efi 
                           /EFI/GRUB/mmx64.efi /EFI/GRUB/shimx64.efi 
                           /EFI/ubuntu/grubx64.efi /EFI/ubuntu/mmx64.efi 
                           /EFI/ubuntu/shimx64.efi 
                           /EFI/ubuntu/grub/x86_64-efi/core.efi 
                           /EFI/ubuntu/grub/x86_64-efi/grub.efi
    
    sda2: __________________________________________________________________________
    
        File system:       btrfs
        Boot sector type:  -
        Boot sector info: 
        Operating System:  Ubuntu 19.04
        Boot files:        /boot/grub/grub.cfg /etc/fstab
    
    sdb1: __________________________________________________________________________
    
        File system:       btrfs
        Boot sector type:  -
        Boot sector info: 
        Operating System:  
        Boot files:        
    
    ============================ Drive/Partition Info: =============================
    
    Drive: sda _____________________________________________________________________
    Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
    Disk model: Samsung SSD 850 
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sda1                   1   976,773,167   976,773,167  ee GPT
    
    
    GUID Partition Table detected.
    
    Partition  Attrs   Start Sector    End Sector  # of Sectors System
    /dev/sda1                 2,048       999,423       997,376 EFI System partition
    /dev/sda2               999,424   976,771,071   975,771,648 Data partition (Linux)
    
    Attributes: R=Required, N=No Block IO, B=Legacy BIOS Bootable, +=More bits set
    
    Drive: sdb _____________________________________________________________________
    Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
    Disk model: ST31000524AS    
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sdb1                   1 1,953,525,167 1,953,525,167  ee GPT
    
    
    GUID Partition Table detected.
    
    Partition  Attrs   Start Sector    End Sector  # of Sectors System
    /dev/sdb1                 2,048 1,953,519,615 1,953,517,568 Data partition (Linux)
    
    Attributes: R=Required, N=No Block IO, B=Legacy BIOS Bootable, +=More bits set
    
    "blkid" output: ________________________________________________________________
    
    Device           UUID                                   TYPE       LABEL
    
    /dev/sda1        4DD8-BE9A                              vfat       
    /dev/sda2        698b5d59-9862-401e-9491-a80ff3ff1090   btrfs      
    /dev/sdb1        70ab0add-dae7-4c2a-a565-4195afd31aa8   btrfs      storage
    
    ========================= "ls -l /dev/disk/by-id" output: ======================
    
    total 0
    lrwxrwxrwx 1 root root  9 Jun 20 09:49 ata-ST31000524AS_5VPBJNHG -> ../../sdb
    lrwxrwxrwx 1 root root 10 Jun 20 09:49 ata-ST31000524AS_5VPBJNHG-part1 -> ../../sdb1
    lrwxrwxrwx 1 root root  9 Jun 20 09:49 ata-Samsung_SSD_850_EVO_500GB_S21HNXAG637490X -> ../../sda
    lrwxrwxrwx 1 root root 10 Jun 20 09:49 ata-Samsung_SSD_850_EVO_500GB_S21HNXAG637490X-part1 -> ../../sda1
    lrwxrwxrwx 1 root root 10 Jun 20 09:49 ata-Samsung_SSD_850_EVO_500GB_S21HNXAG637490X-part2 -> ../../sda2
    lrwxrwxrwx 1 root root  9 Jun 20 09:49 wwn-0x5000c5004959e2a4 -> ../../sdb
    lrwxrwxrwx 1 root root 10 Jun 20 09:49 wwn-0x5000c5004959e2a4-part1 -> ../../sdb1
    lrwxrwxrwx 1 root root  9 Jun 20 09:49 wwn-0x5002538d4021101a -> ../../sda
    lrwxrwxrwx 1 root root 10 Jun 20 09:49 wwn-0x5002538d4021101a-part1 -> ../../sda1
    lrwxrwxrwx 1 root root 10 Jun 20 09:49 wwn-0x5002538d4021101a-part2 -> ../../sda2
    
    ================================ Mount points: =================================
    
    Device           Mount_Point              Type       Options
    
    /dev/sda1        /boot/efi                vfat       (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
    /dev/sda2        /                        btrfs      (rw,relatime,compress=zstd,ssd,discard,space_cache,subvolid=256,subvol=/@)
    /dev/sda2        /home                    btrfs      (rw,relatime,compress=zstd,ssd,discard,space_cache,subvolid=258,subvol=/@home)
    /dev/sda2        /var                     btrfs      (rw,relatime,compress=zstd,ssd,discard,space_cache,subvolid=268,subvol=/@var)
    /dev/sdb1        /mnt/storage             btrfs      (rw,relatime,compress=zstd,ssd,discard,space_cache,subvolid=5,subvol=/)
    
    
    ========================== sda1/EFI/ubuntu/grub.cfg: ===========================
    
    --------------------------------------------------------------------------------
    search.fs_uuid 698b5d59-9862-401e-9491-a80ff3ff1090 root hd0,gpt2 
    set prefix=($root)'/@/boot/grub'
    configfile $prefix/grub.cfg
    --------------------------------------------------------------------------------
    
    =========================== sda2/boot/grub/grub.cfg: ===========================
    
    --------------------------------------------------------------------------------
    #
    # DO NOT EDIT THIS FILE
    #
    # It is automatically generated by grub-mkconfig using templates
    # from /etc/grub.d and settings from /etc/default/grub
    #
    
    ### BEGIN /etc/grub.d/00_header ###
    if [ -s $prefix/grubenv ]; then
      set have_grubenv=true
      load_env
    fi
    if [ "${initrdfail}" = 2 ]; then
       set initrdfail=
    elif [ "${initrdfail}" = 1 ]; then
       set next_entry="${prev_entry}"
       set prev_entry=
       save_env prev_entry
       if [ "${next_entry}" ]; then
          set initrdfail=2
       fi
    fi
    if [ "${next_entry}" ] ; then
       set default="${next_entry}"
       set next_entry=
       save_env next_entry
       set boot_once=true
    else
       set default="0"
    fi
    
    if [ x"${feature_menuentry_id}" = xy ]; then
      menuentry_id_option="--id"
    else
      menuentry_id_option=""
    fi
    
    export menuentry_id_option
    
    if [ "${prev_saved_entry}" ]; then
      set saved_entry="${prev_saved_entry}"
      save_env saved_entry
      set prev_saved_entry=
      save_env prev_saved_entry
      set boot_once=true
    fi
    
    function savedefault {
      if [ -z "${boot_once}" ]; then
        saved_entry="${chosen}"
        save_env saved_entry
      fi
    }
    function initrdfail {
        if [ -n "${have_grubenv}" ]; then if [ -n "${partuuid}" ]; then
          if [ -z "${initrdfail}" ]; then
            set initrdfail=1
            if [ -n "${boot_once}" ]; then
              set prev_entry="${default}"
              save_env prev_entry
            fi
          fi
          save_env initrdfail
        fi; fi
    }
    function recordfail {
      set recordfail=1
      # GRUB lacks write support for btrfs, so recordfail support is disabled.
    }
    function load_video {
      if [ x$feature_all_video_module = xy ]; then
        insmod all_video
      else
        insmod efi_gop
        insmod efi_uga
        insmod ieee1275_fb
        insmod vbe
        insmod vga
        insmod video_bochs
        insmod video_cirrus
      fi
    }
    
    if [ x$feature_default_font_path = xy ] ; then
       font=unicode
    else
    insmod part_gpt
    insmod btrfs
    set root='hd0,gpt2'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
    else
      search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
    fi
        font="/@/usr/share/grub/unicode.pf2"
    fi
    
    if loadfont $font ; then
      set gfxmode=auto
      load_video
      insmod gfxterm
      set locale_dir=$prefix/locale
      set lang=en_CA
      insmod gettext
    fi
    terminal_output gfxterm
    if [ "${recordfail}" = 1 ] ; then
      set timeout=30
    else
      if [ x$feature_timeout_style = xy ] ; then
        set timeout_style=menu
        set timeout=1
      # Fallback normal timeout code in case the timeout_style feature is
      # unavailable.
      else
        set timeout=1
      fi
    fi
    if [ $grub_platform = efi ]; then
      set timeout=30
      if [ x$feature_timeout_style = xy ] ; then
        set timeout_style=menu
      fi
    fi
    ### END /etc/grub.d/00_header ###
    
    ### BEGIN /etc/grub.d/05_debian_theme ###
    set menu_color_normal=white/black
    set menu_color_highlight=black/light-gray
    #set_background_image "images/tile.png";
    
    set menu_color_normal=white/black
    set menu_color_highlight=black/light-gray
    if background_color 0,0,0; then
      clear
    fi
    ### END /etc/grub.d/05_debian_theme ###
    
    ### BEGIN /etc/grub.d/10_linux ###
    function gfxmode {
    	set gfxpayload="${1}"
    	if [ "${1}" = "keep" ]; then
    		set vt_handoff=vt.handoff=1
    	else
    		set vt_handoff=
    	fi
    }
    if [ "${recordfail}" != 1 ]; then
      if [ -e ${prefix}/gfxblacklist.txt ]; then
        if hwmatch ${prefix}/gfxblacklist.txt 3; then
          if [ ${match} = 0 ]; then
            set linux_gfx_mode=keep
          else
            set linux_gfx_mode=text
          fi
        else
          set linux_gfx_mode=text
        fi
      else
        set linux_gfx_mode=keep
      fi
    else
      set linux_gfx_mode=text
    fi
    export linux_gfx_mode
    menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-698b5d59-9862-401e-9491-a80ff3ff1090' {
    	recordfail
    	load_video
    	gfxmode $linux_gfx_mode
    	insmod gzio
    	if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
    	insmod part_gpt
    	insmod btrfs
    	set root='hd0,gpt2'
    	if [ x$feature_platform_search_hint = xy ]; then
    	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
    	else
    	  search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
    	fi
    	linux	/@/boot/vmlinuz-5.0.0-17-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro rootflags=subvol=@  quiet splash $vt_handoff
    	initrd	/@/boot/initrd.img-5.0.0-17-generic
    }
    submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-698b5d59-9862-401e-9491-a80ff3ff1090' {
    	menuentry 'Ubuntu, with Linux 5.0.0-17-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.0.0-17-generic-advanced-698b5d59-9862-401e-9491-a80ff3ff1090' {
    		recordfail
    		load_video
    		gfxmode $linux_gfx_mode
    		insmod gzio
    		if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
    		insmod part_gpt
    		insmod btrfs
    		set root='hd0,gpt2'
    		if [ x$feature_platform_search_hint = xy ]; then
    		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
    		else
    		  search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
    		fi
    		echo	'Loading Linux 5.0.0-17-generic ...'
    		linux	/@/boot/vmlinuz-5.0.0-17-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro rootflags=subvol=@  quiet splash $vt_handoff
    		echo	'Loading initial ramdisk ...'
    		initrd	/@/boot/initrd.img-5.0.0-17-generic
    	}
    	menuentry 'Ubuntu, with Linux 5.0.0-17-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.0.0-17-generic-recovery-698b5d59-9862-401e-9491-a80ff3ff1090' {
    		recordfail
    		load_video
    		insmod gzio
    		if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
    		insmod part_gpt
    		insmod btrfs
    		set root='hd0,gpt2'
    		if [ x$feature_platform_search_hint = xy ]; then
    		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
    		else
    		  search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
    		fi
    		echo	'Loading Linux 5.0.0-17-generic ...'
    		linux	/@/boot/vmlinuz-5.0.0-17-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro recovery nomodeset rootflags=subvol=@ 
    		echo	'Loading initial ramdisk ...'
    		initrd	/@/boot/initrd.img-5.0.0-17-generic
    	}
    	menuentry 'Ubuntu, with Linux 5.0.0-16-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.0.0-16-generic-advanced-698b5d59-9862-401e-9491-a80ff3ff1090' {
    		recordfail
    		load_video
    		gfxmode $linux_gfx_mode
    		insmod gzio
    		if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
    		insmod part_gpt
    		insmod btrfs
    		set root='hd0,gpt2'
    		if [ x$feature_platform_search_hint = xy ]; then
    		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
    		else
    		  search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
    		fi
    		echo	'Loading Linux 5.0.0-16-generic ...'
    		linux	/@/boot/vmlinuz-5.0.0-16-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro rootflags=subvol=@  quiet splash $vt_handoff
    		echo	'Loading initial ramdisk ...'
    		initrd	/@/boot/initrd.img-5.0.0-16-generic
    	}
    	menuentry 'Ubuntu, with Linux 5.0.0-16-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.0.0-16-generic-recovery-698b5d59-9862-401e-9491-a80ff3ff1090' {
    		recordfail
    		load_video
    		insmod gzio
    		if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
    		insmod part_gpt
    		insmod btrfs
    		set root='hd0,gpt2'
    		if [ x$feature_platform_search_hint = xy ]; then
    		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  698b5d59-9862-401e-9491-a80ff3ff1090
    		else
    		  search --no-floppy --fs-uuid --set=root 698b5d59-9862-401e-9491-a80ff3ff1090
    		fi
    		echo	'Loading Linux 5.0.0-16-generic ...'
    		linux	/@/boot/vmlinuz-5.0.0-16-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro recovery nomodeset rootflags=subvol=@ 
    		echo	'Loading initial ramdisk ...'
    		initrd	/@/boot/initrd.img-5.0.0-16-generic
    	}
    }
    
    ### END /etc/grub.d/10_linux ###
    
    ### BEGIN /etc/grub.d/20_linux_xen ###
    
    ### END /etc/grub.d/20_linux_xen ###
    
    ### BEGIN /etc/grub.d/20_memtest86+ ###
    ### END /etc/grub.d/20_memtest86+ ###
    
    ### BEGIN /etc/grub.d/30_os-prober ###
    ### END /etc/grub.d/30_os-prober ###
    
    ### BEGIN /etc/grub.d/30_uefi-firmware ###
    menuentry 'System setup' $menuentry_id_option 'uefi-firmware' {
    	fwsetup
    }
    ### END /etc/grub.d/30_uefi-firmware ###
    
    ### BEGIN /etc/grub.d/40_custom ###
    # This file provides an easy way to add custom menu entries.  Simply type the
    # menu entries you want to add after this comment.  Be careful not to change
    # the 'exec tail' line above.
    ### END /etc/grub.d/40_custom ###
    
    ### BEGIN /etc/grub.d/41_custom ###
    if [ -f  ${config_directory}/custom.cfg ]; then
      source ${config_directory}/custom.cfg
    elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
      source $prefix/custom.cfg;
    fi
    ### END /etc/grub.d/41_custom ###
    --------------------------------------------------------------------------------
    
    =============================== sda2/etc/fstab: ================================
    
    --------------------------------------------------------------------------------
    # /etc/fstab: static file system information.
    #
    # Use 'blkid' to print the universally unique identifier for a
    # device; this may be used with UUID= as a more robust way to name devices
    # that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point>   <type>  <options>       <dump>  <pass>
    # / was on /dev/sda2 during installation
    # /boot/efi was on /dev/sda1 during installation
    UUID=4DD8-BE9A  /boot/efi       vfat    umask=0077      0       1
    # /home was on /dev/sda2 during installation
    /swapfile                                 none            swap    sw              0       0
    
    UUID=698b5d59-9862-401e-9491-a80ff3ff1090 /               btrfs   rw,relatime,compress=zstd,ssd,discard,space_cache,subvol=@ 0       1
    UUID=698b5d59-9862-401e-9491-a80ff3ff1090 /home           btrfs   rw,relatime,compress=zstd,ssd,discard,space_cache,subvol=@home 0       2
    UUID=698b5d59-9862-401e-9491-a80ff3ff1090 /var           btrfs   rw,relatime,compress=zstd,ssd,discard,space_cache,subvol=@var 0       2
    
    UUID="70ab0add-dae7-4c2a-a565-4195afd31aa8" /mnt/storage	btrfs	rw,relatime,compress=zstd,ssd,discard,space_cache 0 2
    
    --------------------------------------------------------------------------------
    
    =================== sda2: Location of files loaded by Grub: ====================
    
               GiB - GB             File                                 Fragment(s)
    
       0.491600037 = 0.527851520    boot/grub/grub.cfg                             1
     224.886360168 = 241.469890560  boot/vmlinuz                                   1
     223.897891998 = 240.408530944  boot/vmlinuz-5.0.0-16-generic                  1
      60.695564270 = 65.171365888   boot/vmlinuz-5.0.0-17-generic                  1
      60.695564270 = 65.171365888   vmlinuz                                        1
     223.897891998 = 240.408530944  vmlinuz.old                                    1
      59.397186279 = 63.777243136   boot/initrd.img-5.0.0-16-generic               2
      83.889099121 = 90.075234304   boot/initrd.img-5.0.0-17-generic               2
      83.889099121 = 90.075234304   initrd.img                                     2
      59.397186279 = 63.777243136   initrd.img.old                                 2
    
    
    ADDITIONAL INFORMATION :
    =================== log of boot-repair 20190620_0949 ===================
    boot-repair version : 4ppa65
    boot-sav version : 4ppa65
    boot-sav-extra version : 4ppa65
    glade2script version : 3.2.3~ppa4
    boot-repair is executed in installed-session (Ubuntu 19.04, disco, Ubuntu, x86_64)
    CPU op-mode(s):      32-bit, 64-bit
    Address sizes:       43 bits physical, 48 bits virtual
    BOOT_IMAGE=/@/boot/vmlinuz-5.0.0-17-generic root=UUID=698b5d59-9862-401e-9491-a80ff3ff1090 ro rootflags=subvol=@ quiet splash
    
    =================== os-prober:
    /dev/sda2:The OS now in use - Ubuntu 19.04 CurrentSession:linux
    
    =================== blkid:
    /dev/sda1: UUID="4DD8-BE9A" TYPE="vfat" PARTUUID="f0c07550-927e-4cad-be6a-0532e560d6c9"
    /dev/sda2: UUID="698b5d59-9862-401e-9491-a80ff3ff1090" UUID_SUB="1879ebe1-05ce-4470-8ff1-d8ccb86d2972" TYPE="btrfs" PARTUUID="62228f92-f611-4fe6-925e-4dedf264cf37"
    /dev/sdb1: LABEL="storage" UUID="70ab0add-dae7-4c2a-a565-4195afd31aa8" UUID_SUB="9926e894-904c-46fe-a908-2cdad6f341f7" TYPE="btrfs" PARTUUID="a08df518-8f2c-4767-a6c4-fc0093156afc"
    
    
    1 disks with OS, 1 OS : 1 Linux, 0 MacOS, 0 Windows, 0 unknown type OS.
    
    
    =================== /etc/grub.d/ :
    drwxr-xr-x 1 root root      218 Apr 16 16:44 grub.d
    total 80
    -rwxr-xr-x 1 root root 10627 Mar 11 19:18 00_header
    -rwxr-xr-x 1 root root  6258 Mar 11 15:59 05_debian_theme
    -rwxr-xr-x 1 root root 13718 Mar 11 19:18 10_linux
    -rwxr-xr-x 1 root root 11497 Mar 11 19:18 20_linux_xen
    -rwxr-xr-x 1 root root  1992 Jan 28  2016 20_memtest86+
    -rwxr-xr-x 1 root root 12059 Mar 11 19:18 30_os-prober
    -rwxr-xr-x 1 root root  1418 Mar 11 19:18 30_uefi-firmware
    -rwxr-xr-x 1 root root   214 Mar 11 19:18 40_custom
    -rwxr-xr-x 1 root root   216 Mar 11 19:18 41_custom
    -rw-r--r-- 1 root root   483 Mar 11 19:18 README
    
    
    
    
    =================== /etc/default/grub :
    
    # If you change this file, run 'update-grub' afterwards to update
    # /boot/grub/grub.cfg.
    # For full documentation of the options in this file, see:
    #   info -f grub -n 'Simple configuration'
    
    GRUB_DEFAULT=0
    GRUB_TIMEOUT=1
    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    GRUB_CMDLINE_LINUX=""
    
    # Uncomment to enable BadRAM filtering, modify to suit your needs
    # This works with Linux (no patch required) and with any kernel that obtains
    # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
    #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
    
    # Uncomment to disable graphical terminal (grub-pc only)
    #GRUB_TERMINAL=console
    
    # The resolution used on graphical terminal
    # note that you can use only modes which your graphic card supports via VBE
    # you can see them in real GRUB with the command `vbeinfo'
    #GRUB_GFXMODE=640x480
    
    # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
    #GRUB_DISABLE_LINUX_UUID=true
    
    # Uncomment to disable generation of recovery mode menu entries
    #GRUB_DISABLE_RECOVERY="true"
    
    # Uncomment to get a beep at grub start
    #GRUB_INIT_TUNE="480 440 1"
    
    
    
    /boot/efi detected in the fstab of sda2: UUID=4DD8-BE9A   (sda1)
    Presence of EFI/Boot file detected: /boot/efi/EFI/Boot/fbx64.efi
    Presence of EFI/Boot file detected: /boot/efi/EFI/Boot/mmx64.efi
    /usr/share/boot-sav/bs-cmd_terminal.sh: line 179: warning: command substitution: ignored null byte in input
    
    =================== efibootmgr -v
    BootCurrent: 0000
    Timeout: 1 seconds
    BootOrder: 0000,0001,0003
    Boot0000* ubuntu	HD(1,GPT,f0c07550-927e-4cad-be6a-0532e560d6c9,0x800,0xf3800)/File(EFIUBUNTUSHIMX64.EFI)
    Boot0001* GRUB	HD(1,GPT,f0c07550-927e-4cad-be6a-0532e560d6c9,0x800,0xf3800)/File(EFIGRUBshimx64.efi)
    
    
    =================== UEFI/Legacy mode:
    BIOS is EFI-compatible, and is setup in EFI-mode for this installed-session.
    SecureBoot disabled. (maybe sec-boot, Please report this message to boot.repair@gmail.com)
    
    
    =================== PARTITIONS & DISKS:
    sda2	: sda,	not-sepboot,	grubenv-ok	grub2,	signed grub-pc grub-efi ,	update-grub,	64,	with-boot,	is-os,	not--efi--part,	fstab-without-boot,	fstab-has-goodEFI,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot,	apt-get,	grub-install,	with--usr,	fstab-without-usr,	not-sep-usr,	standard,	farbios,	notbiosboot, .
    sda1	: sda,	not-sepboot,	no-grubenv	nogrub,	no-docgrub,	no-update-grub,	32,	no-boot,	no-os,	is-correct-EFI,	part-has-no-fstab,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot,	nopakmgr,	nogrubinstall,	no---usr,	part-has-no-fstab,	not-sep-usr,	standard,	not-far,	notbiosboot, /boot/efi.
    sdb1	: sdb,	maybesepboot,	no-grubenv	nogrub,	no-docgrub,	no-update-grub,	32,	no-boot,	no-os,	not--efi--part,	part-has-no-fstab,	part-has-no-fstab,	no-nt,	no-winload,	no-recov-nor-hid,	no-bmgr,	notwinboot,	nopakmgr,	nogrubinstall,	no---usr,	part-has-no-fstab,	not-sep-usr,	standard,	farbios,	notbiosboot, /mnt/storage.
    
    sda	: GPT,	no-BIOS_boot,	has-correctEFI, 	not-usb,	not-mmc, has-os,	2048 sectors * 512 bytes
    sdb	: GPT,	no-BIOS_boot,	has-no-EFIpart, 	not-usb,	not-mmc, no-os,	2048 sectors * 512 bytes
    
    
    =================== parted -lm:
    
    BYT;
    /dev/sda:500GB:scsi:512:512:gpt:ATA Samsung SSD 850:;
    1:1049kB:512MB:511MB:fat32::boot, esp;
    2:512MB:500GB:500GB:btrfs::;
    
    BYT;
    /dev/sdb:1000GB:scsi:512:512:gpt:ATA ST31000524AS:;
    1:1049kB:1000GB:1000GB:btrfs::;
    
    =================== lsblk:
    KNAME TYPE FSTYPE   SIZE LABEL
    sda   disk        465.8G
    sda1  part vfat     487M
    sda2  part btrfs  465.3G
    sdb   disk        931.5G
    sdb1  part btrfs  931.5G storage
    
    KNAME ROTA RO RM STATE   MOUNTPOINT
    sda      0  0  0 running
    sda1     0  0  0         /boot/efi
    sdb      1  0  0 running
    sdb1     1  0  0         /mnt/storage
    
    
    =================== mount:
    sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
    proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
    udev on /dev type devtmpfs (rw,nosuid,relatime,size=8142808k,nr_inodes=2035702,mode=755)
    devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=1642280k,mode=755)
    /dev/sda2 on / type btrfs (rw,relatime,compress=zstd,ssd,discard,space_cache,subvolid=256,subvol=/@)
    securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
    tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
    tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
    tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
    cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)
    cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
    pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
    efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
    bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
    cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
    cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
    cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
    cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
    cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
    cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
    cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
    cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
    cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
    cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
    cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)
    mqueue on /dev/mqueue type mqueue (rw,relatime)
    debugfs on /sys/kernel/debug type debugfs (rw,relatime)
    hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
    systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=36,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=22149)
    sunrpc on /run/rpc_pipefs type rpc_pipefs (rw,relatime)
    fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
    configfs on /sys/kernel/config type configfs (rw,relatime)
    /dev/sda2 on /home type btrfs (rw,relatime,compress=zstd,ssd,discard,space_cache,subvolid=258,subvol=/@home)
    /dev/sda2 on /var type btrfs (rw,relatime,compress=zstd,ssd,discard,space_cache,subvolid=268,subvol=/@var)
    /dev/sda1 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
    /dev/sdb1 on /mnt/storage type btrfs (rw,relatime,compress=zstd,ssd,discard,space_cache,subvolid=5,subvol=/)
    tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=1642276k,mode=700,uid=1000,gid=1000)
    
    
    =================== ls:
    /sys/block/sda (filtered):  alignment_offset bdi capability dev device discard_alignment events events_async events_poll_msecs ext_range hidden holders inflight integrity mq power queue range removable ro sda1 sda2 size slaves stat subsystem trace uevent
    /sys/block/sdb (filtered):  alignment_offset bdi capability dev device discard_alignment events events_async events_poll_msecs ext_range hidden holders inflight integrity mq power queue range removable ro sdb1 size slaves stat subsystem trace uevent
    /dev (filtered):  autofs block bsg btrfs-control bus char console core cpu cpu_dma_latency cuse disk dri drm_dp_aux0 drm_dp_aux1 drm_dp_aux2 ecryptfs fb0 fd full fuse gpiochip0 gpiochip1 hidraw0 hidraw1 hidraw2 hidraw3 hidraw4 hidraw5 hidraw6 hidraw7 hpet hugepages hwrng i2c-0 i2c-1 i2c-10 i2c-11 i2c-2 i2c-3 i2c-4 i2c-5 i2c-6 i2c-7 i2c-8 i2c-9 initctl input kfd kmsg kvm lightnvm log mapper mcelog mem memory_bandwidth mqueue net network_latency network_throughput null port ppp psaux ptmx pts random rfkill rtc rtc0 sda sda1 sda2 sdb sdb1 sg0 sg1 shm snapshot snd stderr stdin stdout udmabuf uhid uinput urandom usb userio vboxdrv vboxdrvu vboxnetctl vboxusb vfio vga_arbiter vhci vhost-net vhost-vsock zero
    ls /dev/mapper:  control
    
    =================== hexdump -n512 -C /dev/sda1
    00000000  eb 58 90 6d 6b 66 73 2e  66 61 74 00 02 08 20 00  |.X.mkfs.fat... .|
    00000010  02 00 00 00 00 f8 00 00  3f 00 ff 00 00 08 00 00  |........?.......|
    00000020  00 38 0f 00 d0 03 00 00  00 00 00 00 02 00 00 00  |.8..............|
    00000030  01 00 06 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
    00000040  80 01 29 9a be d8 4d 4e  4f 20 4e 41 4d 45 20 20  |..)...MNO NAME  |
    00000050  20 20 46 41 54 33 32 20  20 20 0e 1f be 77 7c ac  |  FAT32   ...w|.|
    00000060  22 c0 74 0b 56 b4 0e bb  07 00 cd 10 5e eb f0 32  |".t.V.......^..2|
    00000070  e4 cd 16 cd 19 eb fe 54  68 69 73 20 69 73 20 6e  |.......This is n|
    00000080  6f 74 20 61 20 62 6f 6f  74 61 62 6c 65 20 64 69  |ot a bootable di|
    00000090  73 6b 2e 20 20 50 6c 65  61 73 65 20 69 6e 73 65  |sk.  Please inse|
    000000a0  72 74 20 61 20 62 6f 6f  74 61 62 6c 65 20 66 6c  |rt a bootable fl|
    000000b0  6f 70 70 79 20 61 6e 64  0d 0a 70 72 65 73 73 20  |oppy and..press |
    000000c0  61 6e 79 20 6b 65 79 20  74 6f 20 74 72 79 20 61  |any key to try a|
    000000d0  67 61 69 6e 20 2e 2e 2e  20 0d 0a 00 00 00 00 00  |gain ... .......|
    000000e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
    *
    000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
    00000200
    
    =================== df -Th:
    
    Filesystem                          Type      Size  Used Avail Use% Mounted on
    udev                                devtmpfs  7.8G     0  7.8G   0% /dev
    tmpfs                               tmpfs     1.6G  1.7M  1.6G   1% /run
    /dev/sda2                           btrfs     466G  221G  243G  48% /
    tmpfs                               tmpfs     7.9G  184M  7.7G   3% /dev/shm
    tmpfs                               tmpfs     5.0M     0  5.0M   0% /run/lock
    tmpfs                               tmpfs     7.9G     0  7.9G   0% /sys/fs/cgroup
    /dev/sda2                           btrfs     466G  221G  243G  48% /home
    /dev/sda2                           btrfs     466G  221G  243G  48% /var
    /dev/sda1                           vfat      487M   26M  461M   6% /boot/efi
    /dev/sdb1                           btrfs     932G  166G  765G  18% /mnt/storage
    tmpfs                               tmpfs     1.6G   12K  1.6G   1% /run/user/1000
    
    =================== fdisk -l:
    Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
    Disk model: Samsung SSD 850
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: gpt
    Disk identifier: 10CBC2F2-7AF5-459B-B49B-47243836A5A2
    
    Device      Start       End   Sectors   Size Type
    /dev/sda1    2048    999423    997376   487M EFI System
    /dev/sda2  999424 976771071 975771648 465.3G Linux filesystem
    
    
    Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
    Disk model: ST31000524AS
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: gpt
    Disk identifier: A1914329-3A59-43E9-BADC-3F4E11142CAF
    
    Device     Start        End    Sectors   Size Type
    /dev/sdb1   2048 1953519615 1953517568 931.5G Linux filesystem
    
    
    
    
    =================== Suggested repair
    The default repair of the Boot-Repair utility would reinstall the grub-efi-amd64-signed of sda2, using the following options:        sda1/boot/efi,
    Additional repair would be performed: unhide-bootmenu-10s    use-standard-efi-file
    
    
    =================== Final advice in case of suggested repair
    Please do not forget to make your BIOS boot on sda1/efi/.../grub*.efi file!
    
    
    =================== User settings
    The settings chosen by the user will not act on the boot.

  4. #4
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    Re: Reboot drops to grub shell after kernel update

    What brand/model system?
    What video card/chip?

    Have you updated UEFI from vendor to latest version?
    And updated SSD firmware?
    Samsung has a Linux a version of Magician for Linux it is not in the commercial links, but was in Enterprise. And I have not gotten it to work, but have not tried lately. It now says ISO can be used with DOS disk.
    https://www.samsung.com/semiconducto...ownload/tools/

    All your entries are typical, but I thought drives had to be specified slightly differently with BTRFS?

    Do not run Boot-Repair fixes. You have separate /var partition. Boot-Repair auto mounts standard partitions / & /boot if one exists, but I do not think it adds any other folders that are partitions, so updates may not work.

    I only have ext4 on an older SSD Samsung 840, but like to see reviews like this.
    Optane SSD RAID Performance With ZFS On Linux 8.1, EXT4, XFS, Btrfs, F2FS
    https://www.phoronix.com/scan.php?pa...nux-raid&num=1
    Last edited by oldfred; June 20th, 2019 at 04:21 PM.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  5. #5
    Join Date
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    Re: Reboot drops to grub shell after kernel update

    Quote Originally Posted by oldfred View Post
    What brand/model system?
    What video card/chip?
    Custom built:
    - Asus Prime B450M-A Motherboard
    - AMD Ryzen 2600X
    - 16GB RAM
    - MSI AMD RX 580 graphics

    Quote Originally Posted by oldfred View Post
    Have you updated UEFI from vendor to latest version?
    According to dmidecode, Version 1201 of firmware for Asus Prime B450M-A,

    According to Asus website, this is latest released May 10, 2019

    Quote Originally Posted by oldfred View Post

    And updated SSD firmware?
    Samsung has a Linux a version of Magician for Linux it is not in the commercial links, but was in Enterprise. And I have not gotten it to work, but have not tried lately. It now says ISO can be used with DOS disk.
    https://www.samsung.com/semiconducto...ownload/tools/
    Not something I have thought of or looked into. But, I will check it out as I don't think I've done anything with the firmware on the SSD since I purchased it.

    Quote Originally Posted by oldfred View Post
    All your entries are typical, but I thought drives had to be specified slightly differently with BTRFS?
    What entries are you referring to? I have an almost identical drive layout on my laptop that has not exhibited this issue at all, at least I have something to compare to.

    Quote Originally Posted by oldfred View Post
    Do not run Boot-Repair fixes. You have separate /var partition. Boot-Repair auto mounts standard partitions / & /boot if one exists, but I do not think it adds any other folders that are partitions, so updates may not work.

    I only have ext4 on an older SSD Samsung 840, but like to see reviews like this.
    Optane SSD RAID Performance With ZFS On Linux 8.1, EXT4, XFS, Btrfs, F2FS
    https://www.phoronix.com/scan.php?pa...nux-raid&num=1
    Yeah, didn't plan on running boot-repair as I thought it wouldn't be safe in my configuration. Besides, it never fixed my problem previously when I had a standard EXT4 layout.

    Also, for a while, I was able to fix this issue in between updates by booting the system with manual grub commands at the beginning of my post to get into the installed system, and then execute the following:
    Code:
    # grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader=ubuntu --recheck
    # update-grub
    # update-initramfs -u
    That worked for the last couple of kernel updates, but the latest one it no longer works for me for some reason.

  6. #6
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    Re: Reboot drops to grub shell after kernel update

    Did not realize the sub volumes were in the parameters when I scrolled right.
    I was thinking that mounting with same UUID needed something more, but it is just in parameters.

    If it worked before, and you had to run the update-initramfs -u, that seems like a driver issue.
    Similar to those that load the nVidia driver from nVidia with the .run file. They have to re-run the update-initramfs -u with every kernel update to incorporate the driver, where if installed from Ubuntu repository it is automatically included.

    Do you have a btrfs driver and is it from Ubuntu repository or separately installed?
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  7. #7
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    Re: Reboot drops to grub shell after kernel update

    Quote Originally Posted by oldfred View Post
    Do you have a btrfs driver and is it from Ubuntu repository or separately installed?
    Whatever came with Ubuntu. I set this filesystem layout during the Ubuntu installer.

    If this persists, I may just do a re-install again and just leave it at EXT4, but I don't think that's the issue as I've had this problem since before using BTRFS. I only switch on one of my numerous re-installs due to this.

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