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Thread: grub 2 "invalid signature" chainloader CentOS 6

  1. #1
    Join Date
    Dec 2010
    Beans
    9

    grub 2 "invalid signature" chainloader CentOS 6

    Hello All,

    I am trying to triple boot a system with Ubuntu 11.10, Windows 7, and CentOS 6.2. I am able to boot into each one using os_probe. What I am trying to do is chainload CentOS 6.2 so that I may update kernels and not have to boot into Ubuntu to run update-grub2.

    I was looking at the configuration for Windows 7 and it seems it is using chainloader to boot the Windows boot loader. I copied this config changing the drive location and insmod from ntfs to ext2 but when I try to load I get invalid signature error message. I have done some google searches and tried many thing which have not worked. Any ideas as to what I can do to resolve this issue.

    Here is my configuration for CentOS entry.
    Code:
    menuentry "CentOS" {
            insmod part_msdos
            insmod ext2
            set root='(hd2,msdos1)'
            chainloader +1
    }
    Thank you for your time and have a great day!

    Regards,
    JD

  2. #2
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
    Hidden!
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: grub 2 "invalid signature" chainloader CentOS 6

    Drive number can depend on which drive from BIOS you set to boot from. The BIOS boot drive will always be hd0, even if it is sdc. Then hd numbers with grub are in drive order.

    A new boot script is being tested, try this first:
    Code:
    wget -O bootinfoscript 'http://bootinfoscript.git.sourceforge.net/git/gitweb.cgi?p=bootinfoscript/bootinfoscript;a=blob_plain;f=bootinfoscript;hb=HEAD'
    chmod a+x bootinfoscript
    sudo bash bootinfoscript
    Current version of boot info script:
    Boot Info Script courtesy of forum members meierfra & Gert Hulselmans
    Page with instructions and download:
    http://bootinfoscript.sourceforge.net/
    Paste contents of results.txt in a New Reply, then highlight entire file and click on # in edit panel(code tags) to make it easier to read.
    Or You can generate the tags first by pressing the # icon in the New Reply Edit toolbar and then paste the contents between the generated [ code] paste here [ /code] tags.
    V60 has improved formating and requires code tags to make it legible. New Version is a zip file that you have to extract to get .sh to run.
    Install these before running script:
    sudo apt-get install gawk
    sudo apt-get install xz-utils
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  3. #3
    Join Date
    Dec 2010
    Beans
    9

    Re: grub 2 "invalid signature" chainloader CentOS 6

    Hello oldfred,

    I have checked the boot order in the BIOS and it seems to be correct. When I boot into CentOS 6.2 and look at its own grub config it shows the same drive that I am trying to boot.

    Below you will find the results as requested.

    Code:
                       Boot Info Script 0.60      [17 May 2011]
    
    
    ============================= Boot Info Summary: ===============================
    
     => Windows is installed in the MBR of /dev/sda.
     => Windows is installed in the MBR of /dev/sdb.
     => Grub Legacy is installed in the MBR of /dev/sdc and looks at sector 
        226794808 on boot drive #3 for the stage2 file, but no stage2 files can be 
        found at this location..
     => Grub2 (v1.99) is installed in the MBR of /dev/sdd and looks at sector 1 of 
        the same hard drive for core.img. core.img is at this location and uses an 
        embedded config file:
        
        ---------------------------------------------------------------------------
        search.fs_uuid 48b87fd5-8f5c-42ef-91bc-9822a94c1085 root 
        set prefix=($root)/boot/grub
        ---------------------------------------------------------------------------
        -----.
     => Windows is installed in the MBR of /dev/sde.
    
    sda1: __________________________________________________________________________
    
        File system:       ext4
        Boot sector type:  Grub Legacy
        Boot sector info:  Grub Legacy (v0.97) is installed in the boot sector 
                           of sda1 and looks at sector 25602 of the same hard 
                           drive for the stage2 file.  A stage2 file is at this 
                           location on /dev/sda.  Stage2 looks on partition #1 
                           for /grub/grub.conf.
        Operating System:  
        Boot files:        /grub/menu.lst /grub/grub.conf
    
    sda2: __________________________________________________________________________
    
        File system:       LVM2_member
        Boot sector type:  -
        Boot sector info: 
    
    sdb1: __________________________________________________________________________
    
        File system:       LVM2_member
        Boot sector type:  -
        Boot sector info: 
    
    sdc1: __________________________________________________________________________
    
        File system:       ntfs
        Boot sector type:  Windows Vista/7: NTFS
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  
        Boot files:        
    
    sdd1: __________________________________________________________________________
    
        File system:       ntfs
        Boot sector type:  Windows Vista/7: NTFS
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  
        Boot files:        /bootmgr /Boot/BCD
    
    sdd2: __________________________________________________________________________
    
        File system:       ntfs
        Boot sector type:  Windows Vista/7: NTFS
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  Windows 7
        Boot files:        /Windows/System32/winload.exe
    
    sdd3: __________________________________________________________________________
    
        File system:       ntfs
        Boot sector type:  Windows Vista/7: NTFS
        Boot sector info:  No errors found in the Boot Parameter Block.
        Operating System:  
        Boot files:        
    
    sde1: __________________________________________________________________________
    
        File system:       ext4
        Boot sector type:  -
        Boot sector info: 
        Operating System:  Ubuntu 11.10
        Boot files:        /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img
    
    sde2: __________________________________________________________________________
    
        File system:       Extended Partition
        Boot sector type:  -
        Boot sector info: 
    
    sde5: __________________________________________________________________________
    
        File system:       swap
        Boot sector type:  -
        Boot sector info: 
    
    centos_vg-swap_lv': ____________________________________________________________
    
        File system:       
        Boot sector type:  Unknown
        Boot sector info: 
        Mounting failed:   mount: unknown filesystem type ''
    
    centos_vg-root_lv': ____________________________________________________________
    
        File system:       
        Boot sector type:  Unknown
        Boot sector info: 
        Mounting failed:   mount: unknown filesystem type ''
    mount: unknown filesystem type ''
    
    ============================ Drive/Partition Info: =============================
    
    Drive: sda _____________________________________________________________________
    
    Disk /dev/sda: 74.4 GB, 74355769344 bytes
    255 heads, 63 sectors/track, 9039 cylinders, total 145226112 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sda1    *          2,048       411,647       409,600  83 Linux
    /dev/sda2             411,648   145,225,727   144,814,080  8e Linux LVM
    
    
    Drive: sdb _____________________________________________________________________
    
    Disk /dev/sdb: 74.4 GB, 74355769344 bytes
    255 heads, 63 sectors/track, 9039 cylinders, total 145226112 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sdb1               2,048   145,225,727   145,223,680  8e Linux LVM
    
    
    Drive: sdc _____________________________________________________________________
    
    Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes
    255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sdc1    *             63 3,907,024,064 3,907,024,002   7 NTFS / exFAT / HPFS
    
    
    Drive: sdd _____________________________________________________________________
    
    Disk /dev/sdd: 600.1 GB, 600127266816 bytes
    255 heads, 63 sectors/track, 72961 cylinders, total 1172123568 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sdd1    *          2,048       206,847       204,800   7 NTFS / exFAT / HPFS
    /dev/sdd2             206,848 1,167,925,247 1,167,718,400   7 NTFS / exFAT / HPFS
    /dev/sdd3       1,167,925,248 1,172,119,551     4,194,304   7 NTFS / exFAT / HPFS
    
    
    Drive: sde _____________________________________________________________________
    
    Disk /dev/sde: 600.1 GB, 600127266816 bytes
    255 heads, 63 sectors/track, 72961 cylinders, total 1172123568 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    
    Partition  Boot  Start Sector    End Sector  # of Sectors  Id System
    
    /dev/sde1               2,048 1,168,123,903 1,168,121,856  83 Linux
    /dev/sde2       1,168,125,950 1,172,121,599     3,995,650   5 Extended
    /dev/sde5       1,168,125,952 1,172,121,599     3,995,648  82 Linux swap / Solaris
    
    
    "blkid" output: ________________________________________________________________
    
    Device           UUID                                   TYPE       LABEL
    
    /dev/mapper/centos_vg-root_lv 391ec1a3-b4c7-47f3-9a3d-8b63c3d632eb   ext4       
    /dev/mapper/centos_vg-swap_lv e29a7700-2c82-4d30-b155-1c363fd86e73   swap       
    /dev/sda1        58eda028-6311-43ab-a7c1-61013de52fa1   ext4       
    /dev/sda2        t1zZtF-Fscb-4Yhm-07yo-hwWd-AOPV-iSF0VZ LVM2_member 
    /dev/sdb1        9qXUyR-Asuj-PWqT-GvZp-5Ukt-EGq3-sG8fRa LVM2_member 
    /dev/sdc1        32CEDED661DE0A1C                       ntfs       Data
    /dev/sdd1        EC7AFD927AFD59B2                       ntfs       System Reserved
    /dev/sdd2        C45CC1865CC173A8                       ntfs       
    /dev/sdd3        1C848C60848C3DF0                       ntfs       SWAP
    /dev/sde1        48b87fd5-8f5c-42ef-91bc-9822a94c1085   ext4       
    /dev/sde5        63b735e8-044c-4d1c-9152-1436251d13de   swap       
    
    ========================= "ls -R /dev/mapper/" output: =========================
    
    /dev/mapper:
    centos_vg-root_lv
    centos_vg-swap_lv
    control
    
    ================================ Mount points: =================================
    
    Device           Mount_Point              Type       Options
    
    /dev/sde1        /                        ext4       (rw,errors=remount-ro,commit=0)
    /dev/sr0         /media/CentOS            iso9660    (ro,nosuid,nodev,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500,uhelper=udisks)
    
    
    ============================= sda1/grub/grub.conf: =============================
    
    --------------------------------------------------------------------------------
    # grub.conf generated by anaconda
    #
    # Note that you do not have to rerun grub after making changes to this file
    # NOTICE:  You have a /boot partition.  This means that
    #          all kernel and initrd paths are relative to /boot/, eg.
    #          root (hd2,0)
    #          kernel /vmlinuz-version ro root=/dev/mapper/centos_vg-root_lv
    #          initrd /initrd-[generic-]version.img
    #boot=/dev/sda1
    default=0
    timeout=15
    splashimage=(hd2,0)/grub/splash.xpm.gz
    title CentOS (2.6.32-220.el6.x86_64)
    	root (hd2,0)
    	kernel /vmlinuz-2.6.32-220.el6.x86_64 ro root=/dev/mapper/centos_vg-root_lv rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb rd_LVM_LV=centos_vg/root_lv  KEYBOARDTYPE=pc KEYTABLE=us rd_LVM_LV=centos_vg/swap_lv rd_NO_DM
    	initrd /initramfs-2.6.32-220.el6.x86_64.img
    --------------------------------------------------------------------------------
    
    =================== sda1: Location of files loaded by Grub: ====================
    
               GiB - GB             File                                 Fragment(s)
    
                   =                grub/grub.conf                                 1
                   =                grub/menu.lst                                  1
                   =                grub/stage2                                    1
                   =                initramfs-2.6.32-220.el6.x86_64.img            2
                   =                initrd-2.6.32-220.el6.x86_64kdump.img          1
                   =                vmlinuz-2.6.32-220.el6.x86_64                  1
    
    =========================== sde1/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 $prefix/grubenv ]; then
      set have_grubenv=true
      load_env
    fi
    set default="6"
    if [ "${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 recordfail {
      set recordfail=1
      if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
    }
    
    function load_video {
      insmod vbe
      insmod vga
      insmod video_bochs
      insmod video_cirrus
    }
    
    insmod part_msdos
    insmod ext2
    set root='(hd4,msdos1)'
    search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    if loadfont /usr/share/grub/unicode.pf2 ; then
      set gfxmode=auto
      load_video
      insmod gfxterm
      insmod part_msdos
      insmod ext2
      set root='(hd4,msdos1)'
      search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
      set locale_dir=($root)/boot/grub/locale
      set lang=en_US
      insmod gettext
    fi
    terminal_output gfxterm
    if [ "${recordfail}" = 1 ]; then
      set timeout=-1
    else
      set timeout=5
    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
    if background_color 44,0,30; then
      clear
    fi
    ### END /etc/grub.d/05_debian_theme ###
    
    ### BEGIN /etc/grub.d/10_linux ###
    if [ ${recordfail} != 1 ]; then
      if [ -e ${prefix}/gfxblacklist.txt ]; then
        if hwmatch ${prefix}/gfxblacklist.txt 3; then
          if [ ${match} = 0 ]; then
            set linux_gfx_mode=keep
          else
            set linux_gfx_mode=text
          fi
        else
          set linux_gfx_mode=text
        fi
      else
        set linux_gfx_mode=keep
      fi
    else
      set linux_gfx_mode=text
    fi
    export linux_gfx_mode
    if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
    menuentry 'Ubuntu, with Linux 3.0.0-14-generic' --class ubuntu --class gnu-linux --class gnu --class os {
    	recordfail
    	set gfxpayload=$linux_gfx_mode
    	insmod gzio
    	insmod part_msdos
    	insmod ext2
    	set root='(hd4,msdos1)'
    	search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    	linux	/boot/vmlinuz-3.0.0-14-generic root=UUID=48b87fd5-8f5c-42ef-91bc-9822a94c1085 ro   quiet splash vt.handoff=7
    	initrd	/boot/initrd.img-3.0.0-14-generic
    }
    menuentry 'Ubuntu, with Linux 3.0.0-14-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
    	recordfail
    	insmod gzio
    	insmod part_msdos
    	insmod ext2
    	set root='(hd4,msdos1)'
    	search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    	echo	'Loading Linux 3.0.0-14-generic ...'
    	linux	/boot/vmlinuz-3.0.0-14-generic root=UUID=48b87fd5-8f5c-42ef-91bc-9822a94c1085 ro recovery nomodeset 
    	echo	'Loading initial ramdisk ...'
    	initrd	/boot/initrd.img-3.0.0-14-generic
    }
    submenu "Previous Linux versions" {
    menuentry 'Ubuntu, with Linux 3.0.0-12-generic' --class ubuntu --class gnu-linux --class gnu --class os {
    	recordfail
    	set gfxpayload=$linux_gfx_mode
    	insmod gzio
    	insmod part_msdos
    	insmod ext2
    	set root='(hd4,msdos1)'
    	search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    	linux	/boot/vmlinuz-3.0.0-12-generic root=UUID=48b87fd5-8f5c-42ef-91bc-9822a94c1085 ro   quiet splash vt.handoff=7
    	initrd	/boot/initrd.img-3.0.0-12-generic
    }
    menuentry 'Ubuntu, with Linux 3.0.0-12-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
    	recordfail
    	insmod gzio
    	insmod part_msdos
    	insmod ext2
    	set root='(hd4,msdos1)'
    	search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    	echo	'Loading Linux 3.0.0-12-generic ...'
    	linux	/boot/vmlinuz-3.0.0-12-generic root=UUID=48b87fd5-8f5c-42ef-91bc-9822a94c1085 ro recovery nomodeset 
    	echo	'Loading initial ramdisk ...'
    	initrd	/boot/initrd.img-3.0.0-12-generic
    }
    menuentry 'Ubuntu, with Linux 2.6.38-11-generic' --class ubuntu --class gnu-linux --class gnu --class os {
    	recordfail
    	set gfxpayload=$linux_gfx_mode
    	insmod gzio
    	insmod part_msdos
    	insmod ext2
    	set root='(hd4,msdos1)'
    	search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    	linux	/boot/vmlinuz-2.6.38-11-generic root=UUID=48b87fd5-8f5c-42ef-91bc-9822a94c1085 ro   quiet splash vt.handoff=7
    	initrd	/boot/initrd.img-2.6.38-11-generic
    }
    menuentry 'Ubuntu, with Linux 2.6.38-11-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
    	recordfail
    	insmod gzio
    	insmod part_msdos
    	insmod ext2
    	set root='(hd4,msdos1)'
    	search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    	echo	'Loading Linux 2.6.38-11-generic ...'
    	linux	/boot/vmlinuz-2.6.38-11-generic root=UUID=48b87fd5-8f5c-42ef-91bc-9822a94c1085 ro recovery nomodeset 
    	echo	'Loading initial ramdisk ...'
    	initrd	/boot/initrd.img-2.6.38-11-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+ ###
    menuentry "Memory test (memtest86+)" {
    	insmod part_msdos
    	insmod ext2
    	set root='(hd4,msdos1)'
    	search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    	linux16	/boot/memtest86+.bin
    }
    menuentry "Memory test (memtest86+, serial console 115200)" {
    	insmod part_msdos
    	insmod ext2
    	set root='(hd4,msdos1)'
    	search --no-floppy --fs-uuid --set=root 48b87fd5-8f5c-42ef-91bc-9822a94c1085
    	linux16	/boot/memtest86+.bin console=ttyS0,115200n8
    }
    ### END /etc/grub.d/20_memtest86+ ###
    
    ### BEGIN /etc/grub.d/30_os-prober ###
    menuentry "Windows 7 (loader) (on /dev/sdd1)" --class windows --class os {
    	insmod part_msdos
    	insmod ntfs
    	set root='(hd3,msdos1)'
    	search --no-floppy --fs-uuid --set=root EC7AFD927AFD59B2
    	chainloader +1
    }
    menuentry "CentOS (2.6.32-220.el6.x86_64) (on /dev/mapper/centos_vg-root_lv)" --class gnu-linux --class gnu --class os {
    	insmod part_msdos
    	insmod ext2
    	set root='(hd0,msdos1)'
    	search --no-floppy --fs-uuid --set=root 58eda028-6311-43ab-a7c1-61013de52fa1
    	linux /vmlinuz-2.6.32-220.el6.x86_64 ro root=/dev/mapper/centos_vg-root_lv rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb rd_LVM_LV=centos_vg/root_lv KEYBOARDTYPE=pc KEYTABLE=us rd_LVM_LV=centos_vg/swap_lv rd_NO_DM
    	initrd /initramfs-2.6.32-220.el6.x86_64.img
    }
    ### END /etc/grub.d/30_os-prober ###
    
    ### 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.
    menuentry "CentOS Test " { 
            insmod part_msdos
            insmod ext2
            set root='(hd2,msdos1)'
            chainloader --force +1
    }
    ### END /etc/grub.d/40_custom ###
    
    ### BEGIN /etc/grub.d/41_custom ###
    if [ -f  $prefix/custom.cfg ]; then
      source $prefix/custom.cfg;
    fi
    ### END /etc/grub.d/41_custom ###
    --------------------------------------------------------------------------------
    
    =============================== sde1/etc/fstab: ================================
    
    --------------------------------------------------------------------------------
    # /etc/fstab: static file system information.
    #
    # Use 'blkid -o value -s UUID' 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>
    proc            /proc           proc    nodev,noexec,nosuid 0       0
    # / was on /dev/sde1 during installation
    UUID=48b87fd5-8f5c-42ef-91bc-9822a94c1085 /               ext4    errors=remount-ro 0       1
    # swap was on /dev/sde5 during installation
    UUID=63b735e8-044c-4d1c-9152-1436251d13de none            swap    sw              0       0
    --------------------------------------------------------------------------------
    
    =================== sde1: Location of files loaded by Grub: ====================
    
               GiB - GB             File                                 Fragment(s)
    
                   =                boot/grub/core.img                             1
                   =                boot/grub/grub.cfg                             1
                   =                boot/initrd.img-2.6.38-11-generic              2
                   =                boot/initrd.img-3.0.0-12-generic               2
                   =                boot/initrd.img-3.0.0-14-generic               2
                   =                boot/vmlinuz-2.6.38-11-generic                 1
                   =                boot/vmlinuz-3.0.0-12-generic                  1
                   =                boot/vmlinuz-3.0.0-14-generic                  1
                   =                initrd.img                                     2
                   =                initrd.img.old                                 2
                   =                vmlinuz                                        1
                   =                vmlinuz.old                                    1
    
    ======================== Unknown MBRs/Boot Sectors/etc: ========================
    
    Unknown BootLoader on centos_vg-swap_lv'
    
    
    Unknown BootLoader on centos_vg-root_lv'
    
    
    
    =============================== StdErr Messages: ===============================
    
    xz: (stdin): Compressed data is corrupt
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
    awk: cmd. line:36: Math support is not compiled in
      One or more specified logical volume(s) not found.
      One or more specified logical volume(s) not found.
      One or more specified logical volume(s) not found.
    hexdump: /dev/mapper/centos_vg-swap_lv': No such file or directory
    hexdump: /dev/mapper/centos_vg-swap_lv': No such file or directory
      One or more specified logical volume(s) not found.
      One or more specified logical volume(s) not found.
      One or more specified logical volume(s) not found.
    hexdump: /dev/mapper/centos_vg-root_lv': No such file or directory
    hexdump: /dev/mapper/centos_vg-root_lv': No such file or directory

  4. #4
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
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    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: grub 2 "invalid signature" chainloader CentOS 6

    If booting with grub2, you must be booting sdd. Then sda is hd1.

    I prefer to keep each install on a separate drive which it looks like you have, but then also have each system's boot loader in that same drive. Then any drive failure lets me use BIOS to boot another drive.

    From Ubuntu you can reinstall grub to the MBR of any drive. If drives do not always mount in same order you need to confirm which is which before reinstalling.

    sudo grub-install /dev/sde

    Grub also remembers which drive to reinstall to on grub updates. So you should reset that also:
    #to get grub to remember where to reinstall on updates:
    sudo dpkg-reconfigure grub-pc
    #Enter thru first pages,spacebar to choose/unchoose drive, enter to accept, do not choose partitions
    #To see what drive grub2 uses see this line - grub-pc/install_devices:
    sudo debconf-show grub-pc

    You have Windows in sdd, so I would also reinstall the Windows boot loader to the MBR of sdd.
    How to restore the Ubuntu/XP/Vista/7 bootloader (Updated for Ubuntu 9.10 - grub2) - talsemgeest
    http://ubuntuforums.org/showthread.php?t=1014708

    I would also make sure you have a liveCD or repairCd/USB for the current version of every system you have installed.
    Make your own Windows repairCD (not vendor recovery):
    http://windows.microsoft.com/en-GB/w...em-repair-disc
    http://forums.techarena.in/guides-tutorials/1114725.htm

    Windows 7 repair USB, Also Vista if service pack installed
    http://www.intowindows.com/how-to-re...tion-dvd-disc/
    http://www.webupd8.org/2010/10/creat...usb-drive.html
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  5. #5
    Join Date
    Dec 2010
    Beans
    9

    Re: grub 2 "invalid signature" chainloader CentOS 6

    Oldfred,

    Thank you for your quick response!! I thought that I had each bootloader on its own drive and then use Ubuntus grub to chain load each one. Is there something in the config that is not showing this? Also on my Centos drive it's boot loader is pointing to the same config that I set grub 2 to chain boot. Are you seeing something different? Any other ideas as to what the problem is?

  6. #6
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
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    Hidden!
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: grub 2 "invalid signature" chainloader CentOS 6

    When you have lots of drives it becomes difficult to keep track. And some systems do not always mount them in the same order which makes it even worse. Grub2 often works as it uses both the set root and then the search by UUID to find the boot partition.

    Your centos grub.conf in sda1 shows it booting from root (hd2,0) or the fourth drive. Your manually added entry to 40_custom also shows hd2,0, So drive order must have changed. But if booting from sdd with grub2 then the entry for sda1 would be hd1,1. But you also have to pay attention to partition numbers. In grub legacy hdX,0 is the first, but in grub2 the first partition is hdX,1 or on first drive sda1 it would be hd0,1 for grub2.

    I used to chainboot a lot (to partitions) with grub legacy but when Ubuntu changed to grub2, I mostly stopped using chainload entries. But I did some chainload with grub2 to other MBRs and found the boot drive is always hd0. So my chainload entries I might have in a 40_custom or a flash drive often had to be adjusted depending on which drive I selected in BIOS to boot.

    I found sometimes I just had to experiment with the entry by using e on the grub menu in grub2 and editing the entry until I found the correct drive or partition number.
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  7. #7
    Join Date
    Dec 2010
    Beans
    9

    Re: grub 2 "invalid signature" chainloader CentOS 6

    Thank you so much for your help!!!! I was able to locate the issue and resolve it. It was actually two fold. First the hd setting in the CentOS grub configuration was wrong it should have been hd1,1 (Not sure how this happened as none of the drives changed and I just installed it last night). Second I had to change the grub2 to hd1,1 as you suggested. After changing the above everything is working as it should be. Thanks again for your help and have a great day/weekend


    Regards,
    JD

  8. #8
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
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    Ubuntu 14.04 Trusty Tahr

    Re: grub 2 "invalid signature" chainloader CentOS 6

    Glad you got it working.

    I find with multiple drives and/or multiple systems the bootinfoscript is invaluable for knowing what is where. I normally run it before & after changes to hard drive or new installs, just to document system in detail.
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  9. #9
    Join Date
    Aug 2006
    Beans
    86

    Re: grub 2 "invalid signature" chainloader CentOS 6

    We are wrestling with a similar problem, although both Ubuntu (natty) and Centos are on RAID-1 file systems. Why have you abandoned chainloading in Grub 2?

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