[SOLVED] problem with dual boot ubuntu/w10 at GRUB: cannot load image

**oldfred** · October 16th, 2024

One old fix for some systems that only booted "Windows Boot Entry" was to create a Windows entry that booted Ubuntu.
It only partially worked as next Windows update fixed entry and booted Windows.

Post this from live installer:
sudo efibootmgr -v #if from 24.04 do not use -v as it then includes too much data.

If issues is a Windows issue with BCD, no idea how to fix that.

**pfelelep** · October 16th, 2024

Post this from live installer:
sudo efibootmgr -v #if from 24.04 do not use -v as it then includes too much data.

pfelelep@pfelelep-Inspiron-7559:~$ efibootmgr No BootOrder is set; firmware will attempt recovery
Boot0003* Hard Drive BBS(Floppy,,0x0)0000474f00004e4f97000000010000006f 00480061007200640020004400720069007600650000000501 090001000000007fff040002010c00d041030a000000000101 0600001703120a000000ffff00007fff040001043e00ef4764 2dc93ba041ac194d51d01b4ce6340053003400310042004e00 4d003000300034003400320031003500200054002000200020 00200000007fff04000000424f

here is the boot info summary from boot repair:

Code:

============================== Boot Info Summary ===============================


 => Windows 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/Boot/bkpbootx64.efi /efi/Boot/bootx64.efi 
                       /efi/Boot/fbx64.efi /efi/Boot/mmx64.efi 
                       /efi/Manjaro/grubx64.efi /efi/ubuntu/grubx64.efi 
                       /efi/ubuntu/mmx64.efi /efi/ubuntu/shimx64.efi 
                       /efi/ubuntu/grub.cfg /efi/Microsoft/Boot/bootmgfw.efi 
                       /efi/Microsoft/Boot/bootmgr.efi 
                       /efi/Microsoft/Boot/SecureBootRecovery.efi /bootmgr


sda2: __________________________________________________________________________


    File system:       
    Boot sector type:  -
    Boot sector info: 


sda3: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  Windows 10 or 11
    Boot files:        /bootmgr /Windows/System32/winload.exe


sda4: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  According to the info in the boot sector, sda4 starts 
                       at sector 1618642944. But according to the info from 
                       fdisk, sda4 starts at sector 504604672.
    Operating System:  
    Boot files:        


sda5: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  According to the info in the boot sector, sda5 starts 
                       at sector 1927069696. But according to the info from 
                       fdisk, sda5 starts at sector 924035072.
    Operating System:  
    Boot files:        


sda6: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  According to the info in the boot sector, sda6 starts 
                       at sector 1928742912. But according to the info from 
                       fdisk, sda6 starts at sector 925708288.
    Operating System:  
    Boot files:        


sda7: __________________________________________________________________________


    File system:       btrfs
    Boot sector type:  -
    Boot sector info: 
    Operating System:  Ubuntu 24.10
    Boot files:        /boot/grub/grub.cfg /etc/fstab /etc/default/grub


sdb1: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        


sdb2: __________________________________________________________________________


    File system:       BIOS Boot partition
    Boot sector type:  Unknown
    Boot sector info: 


sdb3: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        


sdb4: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        




================================ 2 OS detected =================================


OS#1 (linux):   The OS now in use - Ubuntu 24.10 on sda7
OS#2 (windows):   Windows 10 or 11 on sda3


================================ Host/Hardware =================================


CPU architecture: 64-bit
Video: GM107M [GeForce GTX 960M] HD Graphics 530 from NVIDIA Corporation Intel Corporation
BOOT_IMAGE of the installed session in use:
/boot/vmlinuz-6.11.0-8-generic root=UUID=d9350585-506b-4b2a-b402-eba8497ffdaf ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7
df -Th / : /dev/sda7      btrfs   40G   22G   17G  57% /


===================================== UEFI =====================================


BIOS/UEFI firmware: 1.3.1(1.3) from Dell Inc.
The firmware is EFI-compatible, and is set in EFI-mode for this installed-session.
No EFI in dmseg.
SecureBoot disabled - This system doesn't support Secure Boot.
No BootOrder is set; firmware will attempt recovery
Boot0003* Hard Drive    BBS(Floppy,,0x0)0000474f00004e4f97000000010000006f00480061007200640020004400720069007600650000000501090001000000007fff040002010c00d041030a0000000001010600001703120a000000ffff00007fff040001043e00ef47642dc93ba041ac194d51d01b4ce6340053003400310042004e004d00300030003400340032003100350020005400200020002000200000007fff04000000424f




============================= Drive/Partition Info =============================


Disks info: ____________________________________________________________________


sda    : is-GPT,    no-BIOSboot,    has---ESP,     not-usb,    not-mmc, has-os,    has-win,    2048 sectors * 512 bytes
sdb    : is-GPT,    hasBIOSboot,    has-noESP,     not-usb,    not-mmc, no-os,    no-wind,    2048 sectors * 512 bytes


Partitions info (1/3): _________________________________________________________


sda7    : is-os,    64, apt-get,    signed grub-efi ,    grub2,    grub-install,    grubenv-ok,    update-grub,    end-after-100GB
sdb4    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sdb3    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sdb1    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sda4    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sda5    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sda3    : is-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sda1    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    not-far
sda6    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB


Partitions info (2/3): _________________________________________________________


sda7    : isnotESP,    fstab-has-goodEFI,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, btrfs
sdb4    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, ntfs
sdb3    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, ntfs
sdb1    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, ntfs
sda4    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, ntfs
sda5    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    recovery-or-hidden,    no-bmgr,    notwinboot, ntfs
sda3    : isnotESP,    part-has-no-fstab,    no-nt,    haswinload,    no-recov-nor-hid,    bootmgr,    notwinboot, ntfs
sda1    : is---ESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    bootmgr,    notwinboot, vfat
sda6    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    recovery-or-hidden,    no-bmgr,    notwinboot, ntfs


Partitions info (3/3): _________________________________________________________


sda7    : not--sepboot,    with-boot,    fstab-without-boot,    not-sep-usr,    with--usr,    fstab-without-usr,    std-grub.d,    sda
sdb4    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sdb
sdb3    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sdb
sdb1    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sdb
sda4    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda
sda5    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda
sda3    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda
sda1    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda
sda6    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda


fdisk -l (filtered): ___________________________________________________________


Disk sda: 453.23 GiB, 486650431488 bytes, 950489124 sectors
Disk identifier: 8B5DCA2D-7E5D-4004-ADE0-F471AC7C06E6
         Start       End   Sectors   Size Type
sda1       2048   1026047   1024000   500M EFI System
sda2    1026048   1288191    262144   128M Microsoft reserved
sda3    1288192 422440732 421152541 200.8G Microsoft basic data
sda4  504604672 828987391 324382720 154.7G Microsoft basic data
sda5  924035072 925708287   1673216   817M Windows recovery environment
sda6  925708288 950489087  24780800  11.8G Windows recovery environment
sda7  422440734 504604671  82163938  39.2G Linux filesystem
Partition table entries are not in disk order.
Disk sdb: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk identifier: C84F2E0C-0CF3-4DB4-995D-BD65A63798A4
          Start        End    Sectors   Size Type
sdb1        2048 1797715967 1797713920 857.2G Microsoft basic data
sdb2  1797715968 1797718015       2048     1M BIOS boot
sdb3  1797718016 2883026943 1085308928 517.5G Microsoft basic data
sdb4  2883026944 3516325887  633298944   302G Microsoft basic data


parted -lm (filtered): _________________________________________________________


sda:487GB:scsi:512:512:gpt:ATA Samsung SSD 860:;
1:1049kB:525MB:524MB:fat32:EFI system partition:boot, esp;
2:525MB:660MB:134MB::Microsoft reserved partition:msftres;
3:660MB:216GB:216GB:ntfs:Basic data partition:msftdata;
7:216GB:258GB:42.1GB:btrfs:root:;
4:258GB:424GB:166GB:ntfs:Basic data partition:msftdata;
5:473GB:474GB:857MB:ntfs::hidden, diag;
6:474GB:487GB:12.7GB:ntfs::hidden, diag;
sdb:2000GB:scsi:512:512:gpt:ATA Samsung SSD 870:;
1:1049kB:920GB:920GB:ntfs:Basic data partition:msftdata;
2:920GB:920GB:1049kB:::bios_grub;
3:920GB:1476GB:556GB:ntfs:Basic data partition:msftdata;
4:1476GB:1800GB:324GB:ntfs:Basic data partition:msftdata;


Free space >10MiB: ______________________________________________________________


sda: 404779MiB:451189MiB:46410MiB
sdb: 1716956MiB:1907729MiB:190773MiB


blkid (filtered): ______________________________________________________________


NAME   FSTYPE   UUID                                 PARTUUID                             LABEL             PARTLABEL
sda                                                                                                         
├─sda1 vfat     4887-94F5                            02efc03c-0d0c-43a9-966e-a6ad53c9edc5 ESP               EFI system partition
├─sda2                                               f1410272-14bb-4f7d-902e-00c6476614da                   Microsoft reserved partition
├─sda3 ntfs     CAB25579B2556B49                     f6803be0-038e-4009-b1b4-00e11a35631b OS                Basic data partition
├─sda4 ntfs     E6BA3670BA363CFD                     6a32a8f3-3407-4639-8ef8-23d8357c216d Vrac primary      Basic data partition
├─sda5 ntfs     0E029F42029F2DA9                     deca5c9e-e30b-4e86-bb82-db98815c1b35 WINRETOOLS        
├─sda6 ntfs     AEC4A02AC49FF2B7                     3e650648-465c-47f3-a779-7bf06125fb6d Image             
└─sda7 btrfs    d9350585-506b-4b2a-b402-eba8497ffdaf 2b15366a-c7a7-ef4a-bee8-6f65e8462058                   root
sdb                                                                                                         
├─sdb1 ntfs     0296F50996F4FDCB                     9d17a0a0-6488-4fb9-b86d-2538dbd4b36a Data              Basic data partition
├─sdb2                                               dd84a79c-1d3b-4e5e-a778-4eee6f623cba                   
├─sdb3 ntfs     FE0A058E0A05455D                     92cfda1c-bec8-433f-964b-0dc2796eb769 Games             Basic data partition
└─sdb4 ntfs     DE5ACB645ACB3853                     9a33b971-5eb6-40b9-b3f4-1479487d829d Save and Recovery Basic data partition


Mount points (filtered): _______________________________________________________


                        Avail Use% Mounted on
/dev/sda3               49.7G  75% /mnt/boot-sav/sda3
/dev/sda4               70.2G  55% /mnt/boot-sav/sda4
/dev/sda5              420.6M  49% /mnt/boot-sav/sda5
/dev/sda6               69.4M  99% /mnt/boot-sav/sda6
/dev/sda7               16.8G  56% /
/dev/sdb1              147.8G  83% /media/pfelelep/Data
/dev/sdb3              182.5G  65% /mnt/boot-sav/sdb3
/dev/sdb4                 42G  86% /mnt/boot-sav/sdb4
efivarfs                52.2K  78% /sys/firmware/efi/efivars


Mount options (filtered): ______________________________________________________


/dev/sda3              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sda4              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sda5              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sda6              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sda7              btrfs           rw,relatime,ssd,discard=async,space_cache=v2,subvolid=5,subvol=/
/dev/sdb1              ntfs3           rw,nosuid,nodev,relatime,uid=1000,gid=1000,iocharset=utf8
/dev/sdb3              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sdb4              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096


===================== sda1/efi/ubuntu/grub.cfg (filtered) ======================


search.fs_uuid d9350585-506b-4b2a-b402-eba8497ffdaf root hd0,gpt7 
set prefix=($root)'/boot/grub'
configfile $prefix/grub.cfg


====================== sda7/boot/grub/grub.cfg (filtered) ======================


Ubuntu   d9350585-506b-4b2a-b402-eba8497ffdaf
Windows Boot Manager (on sda1)   osprober-efi-4887-94F5
### END /etc/grub.d/30_os-prober ###
UEFI Firmware Settings   uefi-firmware
### END /etc/grub.d/30_uefi-firmware ###


========================== sda7/etc/fstab (filtered) ===========================


# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda7 during curtin installation
/dev/disk/by-uuid/d9350585-506b-4b2a-b402-eba8497ffdaf / btrfs defaults 0 1
# /boot/efi was on /dev/sda1 during curtin installation
UUID=4887-94F5  /boot/efi       vfat    defaults      0       1


======================= sda7/etc/default/grub (filtered) =======================


GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`( . /etc/os-release; echo ${NAME:-Ubuntu} ) 2>/dev/null || echo Ubuntu`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
GRUB_DISABLE_OS_PROBER=false


==================== sda7: Location of files loaded by Grub ====================


           GiB - GB             File                                 Fragment(s)
 217.949484825 = 234.021477376  boot/grub/grub.cfg                             1
 207.728102684 = 223.046351872  boot/vmlinuz                                   1
 207.728102684 = 223.046351872  boot/vmlinuz-6.11.0-8-generic                  1
 207.453169823 = 222.751144960  boot/vmlinuz-6.8.0-45-generic                  1
 207.453169823 = 222.751144960  boot/vmlinuz.old                               1
 223.713049889 = 240.210058240  boot/initrd.img                                2
 223.713049889 = 240.210058240  boot/initrd.img-6.11.0-8-generic               2
 208.734850883 = 224.127339520  boot/initrd.img-6.8.0-41-generic               2
 223.657198906 = 240.150088704  boot/initrd.img-6.8.0-45-generic               2
 223.657198906 = 240.150088704  boot/initrd.img.old                            2


===================== sda7: ls -l /etc/grub.d/ (filtered) ======================


-rwxr-xr-x 1 root root 18133 Apr  4  2024 10_linux
-rwxr-xr-x 1 root root 43202 Apr  4  2024 10_linux_zfs
-rwxr-xr-x 1 root root 14513 Apr  4  2024 20_linux_xen
-rwxr-xr-x 1 root root   786 Apr  4  2024 25_bli
-rwxr-xr-x 1 root root 13120 Apr  4  2024 30_os-prober
-rwxr-xr-x 1 root root  1174 Apr  4  2024 30_uefi-firmware
-rwxr-xr-x 1 root root   722 Apr  5  2024 35_fwupd
-rwxr-xr-x 1 root root   214 Apr  4  2024 40_custom
-rwxr-xr-x 1 root root   215 Apr  4  2024 41_custom






Suggested repair: ______________________________________________________________


The default repair of the Boot-Repair utility would reinstall the grub-efi of
sda7,
using the following options:  sda1/boot/efi
Additional repair would be performed: unhide-bootmenu-10s use-standard-efi-file restore-efi-backups


Final advice in case of suggested repair: ______________________________________


Please do not forget to make your UEFI firmware boot on the The OS now in use - Ubuntu 24.10 entry (sda1/efi/****/grub****.efi (**** will be updated in the final message) file) !
If your computer reboots directly into Windows, try to change the boot order in your UEFI firmware.
If your UEFI firmware does not allow to change the boot order, change the default boot entry of the Windows bootloader.
For example you can boot into Windows, then type the following command in an admin command prompt:
bcdedit /set {bootmgr} path \EFI\****\grub****.efi (**** will be updated in the final message)

I am really sorry for this mess, I am really grateful for your help.

**oldfred** · October 16th, 2024

While you have an old BIOS boot of Windows in MBR, that would not be used with UEFI boot. But you must make sure UEFI settings are for UEFI.
Some older Dell systems needed legacy boot on, even when using UEFI. Even mentioned in man page on efibootmgr that some need legacy on.
Newer systems should have legacy/BIOS/CSM off.

Latest efibootmgr does not show the Windows entry?

Was there some reason for btrfs over normal default of ext4. I have only used ext4. Some more advanced users like some of the other Linux formats for advanced features, but best used by experienced Linux users. Needs some different settings in grub & installation of its repair tools.

You should be able to use Boot-Repair's advanced mode to select install & drive for boot files. Both systems share ESP on sda1. You show both /Microsoft & /ubuntu folders in ESP for booting.

Windows or Dell are usually pretty good about updating UEFI firmware. Do you have latest available from Dell? It may not be very new now, but if newer is available best to install it.
Compare to vendors support site
sudo dmidecode -s bios-version

With two drives, I prefer each drive have install if drives are similar or both HDD or both SSD. Both gpt with ESP - efi system partition, so either drive can boot without other drive.
But SSD is so much better then have both systems on SSD and data on HDD.

**tea for one** · October 16th, 2024

Originally Posted by pfelelep

pfelelep@pfelelep-Inspiron-7559:~$ efibootmgr No BootOrder is set; firmware will attempt recovery
Boot0003* Hard Drive BBS(Floppy,,0x0)0000474f00004e4f97000000010000006f 00480061007200640020004400720069007600650000000501 090001000000007fff040002010c00d041030a000000000101 0600001703120a000000ffff00007fff040001043e00ef4764 2dc93ba041ac194d51d01b4ce6340053003400310042004e00 4d003000300034003400320031003500200054002000200020 00200000007fff04000000424f

Believe it or not, the message "No BootOrder is set; firmware will attempt recovery" is good news.
When you reboot, the UEFI firmware will populate the efibootmgr with entries.

What happens when you reboot?

**pfelelep** · October 17th, 2024

Originally Posted by oldfred

Was there some reason for btrfs over normal default of ext4. I have only used ext4. Some more advanced users like some of the other Linux formats for advanced features, but best used by experienced Linux users.

I was on Manjaro before, a (expert) friend of mine installed it for me, that might have been the reason.

Originally Posted by oldfred

You should be able to use Boot-Repair's advanced mode to select install & drive for boot files.

I am not sure to understand what you mean? I'll use bootrepair advanced mode, and select "repair windows boot files"?

Originally Posted by oldfred

Windows or Dell are usually pretty good about updating UEFI firmware. Do you have latest available from Dell? It may not be very new now, but if newer is available best to install it.
Compare to vendors support site

Yes, I checked, I have the latest BIOS version 1.3.1

Originally Posted by oldfred

With two drives, I prefer each drive have install if drives are similar or both HDD or both SSD. Both gpt with ESP - efi system partition, so either drive can boot without other drive.
But SSD is so much better then have both systems on SSD and data on HDD.

that's a good idea, I might consider that in the near future, thank you for the suggestion!

@tea for one:
thank you for the good news

I will attempt the boot repair now, I only created the boot info summary to share here (I am slow but I want to understand in the process, thank you everyone for your patience)

**pfelelep** · October 17th, 2024

Unfortunately, I am back on the very beginning: GRUB is installed but selecting windows boot manager on sda1 gives me the same "error cannot load image"

and selecting Ubuntu works: here am I, writing this message.

here is the boot repair log:

Code:

boot-repair-4ppa2081                                              [20241017_1453]

============================= Boot Repair Summary ==============================








Default settings: ______________________________________________________________


The default repair of the Boot-Repair utility would reinstall the grub-efi of
sda7,
using the following options:  sda1/boot/efi
Additional repair would be performed: unhide-bootmenu-10s use-standard-efi-file restore-efi-backups


Final advice in case of suggested repair: ______________________________________


Please do not forget to make your UEFI firmware boot on the The OS now in use - Ubuntu 24.10 entry (sda1/efi/****/grub****.efi (**** will be updated in the final message) file) !
If your computer reboots directly into Windows, try to change the boot order in your UEFI firmware.
If your UEFI firmware does not allow to change the boot order, change the default boot entry of the Windows bootloader.
For example you can boot into Windows, then type the following command in an admin command prompt:
bcdedit /set {bootmgr} path \EFI\****\grub****.efi (**** will be updated in the final message)


User settings: _________________________________________________________________


GPT PMBR size mismatch (1953525167 != 3907029167) will be corrected by write.
modprobe: FATAL: Module efivars not found in directory /lib/modules/6.11.0-8-generic
The settings chosen by the user will reinstall the grub-efi of
sda7,
using the following options:  sda1/boot/efi
Additional repair will be performed:  unhide-bootmenu-10s win-legacy-basic-fix use-standard-efi-file restore-efi-backups




rm /mnt/boot-sav/sda1/efi/Boot/bootx64.efi
mv /mnt/boot-sav/sda1/efi/Boot/bkpbootx64.efi /mnt/boot-sav/sda1/efi/Boot/bootx64.efi
Quantity of real Windows: 1
Mount /dev/sda1 on /boot/efi


===================== Reinstall the grub-efi of /dev/sda7 ======================


grub-install --version
grub-install (GRUB) 2.12-5ubuntu5
modprobe: FATAL: Module efivars not found in directory /lib/modules/6.11.0-8-generic
modprobe efivars


efibootmgr -v (filtered) before grub install
No BootOrder is set; firmware will attempt recovery
Boot0003* Hard Drive    BBS(Floppy,,0x0)0000474f00004e4f97000000010000006f00480061007200640020004400720069007600650000000501090001000000007fff040002010c00d041030a0000000001010600001703120a000000ffff00007fff040001043e00ef47642dc93ba041ac194d51d01b4ce6340053003400310042004e004d00300030003400340032003100350020005400200020002000200000007fff04000000424f


uname -r
6.11.0-8-generic


grub-install --efi-directory=/boot/efi --target=x86_64-efi
Installing for x86_64-efi platform.
Installation finished. No error reported.
df /dev/sda1
mv /boot/efi/EFI/Boot/bootx64.efi /boot/efi/EFI/Boot/bkpbootx64.efi
cp /boot/efi/efi/ubuntu/grubx64.efi /boot/efi/EFI/Boot/bootx64.efi


grub-install --efi-directory=/boot/efi --target=x86_64-efi
Installing for x86_64-efi platform.
Installation finished. No error reported.


efibootmgr -v (filtered) after grub install
BootOrder: 0000
Boot0000* Ubuntu    HD(1,GPT,02efc03c-0d0c-43a9-966e-a6ad53c9edc5,0x800,0xfa000)/File(EFIubuntushimx64.efi)
Boot0003* Hard Drive    BBS(Floppy,,0x0)0000474f00004e4f97000000010000006f00480061007200640020004400720069007600650000000501090001000000007fff040002010c00d041030a0000000001010600001703120a000000ffff00007fff040001043e00ef47642dc93ba041ac194d51d01b4ce6340053003400310042004e004d00300030003400340032003100350020005400200020002000200000007fff04000000424f


update-grub
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/kdump-tools.cfg'
Found linux image: /boot/vmlinuz-6.11.0-8-generic
Found initrd image: /boot/initrd.img-6.11.0-8-generic
Found linux image: /boot/vmlinuz-6.8.0-45-generic
Found initrd image: /boot/initrd.img-6.8.0-45-generic
Found memtest86+ 64bit EFI image: /boot/memtest86+x64.efi
Found Windows Boot Manager on /dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for UEFI Firmware Settings ...


Unhide GRUB boot menu in sda7/boot/grub/grub.cfg


Boot successfully repaired.


You can now reboot your computer.
Please do not forget to make your UEFI firmware boot on the The OS now in use - Ubuntu 24.10 entry (sda1/efi/ubuntu/grubx64.efi file) !
If your computer reboots directly into Windows, try to change the boot order in your UEFI firmware.
If your UEFI firmware does not allow to change the boot order, change the default boot entry of the Windows bootloader.
For example you can boot into Windows, then type the following command in an admin command prompt:
bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi




============================ Boot Info After Repair ============================


 => Windows 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/Boot/bkpbootx64.efi /efi/Boot/bootx64.efi 
                       /efi/Boot/fbx64.efi /efi/Boot/mmx64.efi 
                       /efi/Manjaro/grubx64.efi /efi/ubuntu/grubx64.efi 
                       /efi/ubuntu/mmx64.efi /efi/ubuntu/shimx64.efi 
                       /efi/ubuntu/grub.cfg /efi/Microsoft/Boot/bootmgfw.efi 
                       /efi/Microsoft/Boot/bootmgr.efi 
                       /efi/Microsoft/Boot/SecureBootRecovery.efi /bootmgr


sda2: __________________________________________________________________________


    File system:       
    Boot sector type:  -
    Boot sector info: 


sda3: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  Windows 10 or 11
    Boot files:        /bootmgr /Windows/System32/winload.exe


sda4: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  According to the info in the boot sector, sda4 starts 
                       at sector 1618642944. But according to the info from 
                       fdisk, sda4 starts at sector 504604672.
    Operating System:  
    Boot files:        


sda5: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  According to the info in the boot sector, sda5 starts 
                       at sector 1927069696. But according to the info from 
                       fdisk, sda5 starts at sector 924035072.
    Operating System:  
    Boot files:        


sda6: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  According to the info in the boot sector, sda6 starts 
                       at sector 1928742912. But according to the info from 
                       fdisk, sda6 starts at sector 925708288.
    Operating System:  
    Boot files:        


sda7: __________________________________________________________________________


    File system:       btrfs
    Boot sector type:  -
    Boot sector info: 
    Operating System:  Ubuntu 24.10
    Boot files:        /boot/grub/grub.cfg /etc/fstab /etc/default/grub


sdb1: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        


sdb2: __________________________________________________________________________


    File system:       BIOS Boot partition
    Boot sector type:  Unknown
    Boot sector info: 


sdb3: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        


sdb4: __________________________________________________________________________


    File system:       ntfs
    Boot sector type:  NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        




================================ 2 OS detected =================================


OS#1 (linux):   The OS now in use - Ubuntu 24.10 on sda7
OS#2 (windows):   Windows 10 or 11 on sda3


================================ Host/Hardware =================================


CPU architecture: 64-bit
Video: GM107M [GeForce GTX 960M] HD Graphics 530 from NVIDIA Corporation Intel Corporation
BOOT_IMAGE of the installed session in use:
/boot/vmlinuz-6.11.0-8-generic root=UUID=d9350585-506b-4b2a-b402-eba8497ffdaf ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7
df -Th / : /dev/sda7      btrfs   40G   23G   17G  58% /


===================================== UEFI =====================================


BIOS/UEFI firmware: 1.3.1(1.3) from Dell Inc.
The firmware is EFI-compatible, and is set in EFI-mode for this installed-session.
No EFI in dmseg.
SecureBoot disabled - This system doesn't support Secure Boot.
BootOrder: 0000
Boot0000* Ubuntu    HD(1,GPT,02efc03c-0d0c-43a9-966e-a6ad53c9edc5,0x800,0xfa000)/File(\EFI\ubuntu\shimx64.efi)
Boot0003* Hard Drive    BBS(Floppy,,0x0)0000474f00004e4f97000000010000006f00480061007200640020004400720069007600650000000501090001000000007fff040002010c00d041030a0000000001010600001703120a000000ffff00007fff040001043e00ef47642dc93ba041ac194d51d01b4ce6340053003400310042004e004d00300030003400340032003100350020005400200020002000200000007fff04000000424f




============================= Drive/Partition Info =============================


Disks info: ____________________________________________________________________


sda    : is-GPT,    no-BIOSboot,    has---ESP,     not-usb,    not-mmc, has-os,    has-win,    2048 sectors * 512 bytes
sdb    : is-GPT,    hasBIOSboot,    has-noESP,     not-usb,    not-mmc, no-os,    no-wind,    2048 sectors * 512 bytes


Partitions info (1/3): _________________________________________________________


sda7    : is-os,    64, apt-get,    signed grub-efi ,    grub2,    grub-install,    grubenv-ok,    update-grub,    end-after-100GB
sdb4    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sdb3    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sdb1    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sda4    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sda5    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sda3    : is-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB
sda1    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    not-far
sda6    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    end-after-100GB


Partitions info (2/3): _________________________________________________________


sda7    : isnotESP,    fstab-has-goodEFI,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, btrfs
sdb4    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, ntfs
sdb3    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, ntfs
sdb1    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, ntfs
sda4    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    no-bmgr,    notwinboot, ntfs
sda5    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    recovery-or-hidden,    no-bmgr,    notwinboot, ntfs
sda3    : isnotESP,    part-has-no-fstab,    no-nt,    haswinload,    no-recov-nor-hid,    bootmgr,    notwinboot, ntfs
sda1    : is---ESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    bootmgr,    notwinboot, vfat
sda6    : isnotESP,    part-has-no-fstab,    no-nt,    no-winload,    recovery-or-hidden,    no-bmgr,    notwinboot, ntfs


Partitions info (3/3): _________________________________________________________


sda7    : not--sepboot,    with-boot,    fstab-without-boot,    not-sep-usr,    with--usr,    fstab-without-usr,    std-grub.d,    sda
sdb4    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sdb
sdb3    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sdb
sdb1    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sdb
sda4    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda
sda5    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda
sda3    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda
sda1    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda
sda6    : not--sepboot,    no---boot,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda


fdisk -l (filtered): ___________________________________________________________


Disk sda: 453.23 GiB, 486650431488 bytes, 950489124 sectors
Disk identifier: 8B5DCA2D-7E5D-4004-ADE0-F471AC7C06E6
         Start       End   Sectors   Size Type
sda1       2048   1026047   1024000   500M EFI System
sda2    1026048   1288191    262144   128M Microsoft reserved
sda3    1288192 422440732 421152541 200.8G Microsoft basic data
sda4  504604672 828987391 324382720 154.7G Microsoft basic data
sda5  924035072 925708287   1673216   817M Windows recovery environment
sda6  925708288 950489087  24780800  11.8G Windows recovery environment
sda7  422440734 504604671  82163938  39.2G Linux filesystem
Partition table entries are not in disk order.
Disk sdb: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk identifier: C84F2E0C-0CF3-4DB4-995D-BD65A63798A4
          Start        End    Sectors   Size Type
sdb1        2048 1797715967 1797713920 857.2G Microsoft basic data
sdb2  1797715968 1797718015       2048     1M BIOS boot
sdb3  1797718016 2883026943 1085308928 517.5G Microsoft basic data
sdb4  2883026944 3516325887  633298944   302G Microsoft basic data


parted -lm (filtered): _________________________________________________________


sda:487GB:scsi:512:512:gpt:ATA Samsung SSD 860:;
1:1049kB:525MB:524MB:fat32:EFI system partition:boot, esp;
2:525MB:660MB:134MB::Microsoft reserved partition:msftres;
3:660MB:216GB:216GB:ntfs:Basic data partition:msftdata;
7:216GB:258GB:42.1GB:btrfs:root:;
4:258GB:424GB:166GB:ntfs:Basic data partition:msftdata;
5:473GB:474GB:857MB:ntfs::hidden, diag;
6:474GB:487GB:12.7GB:ntfs::hidden, diag;
sdb:2000GB:scsi:512:512:gpt:ATA Samsung SSD 870:;
1:1049kB:920GB:920GB:ntfs:Basic data partition:msftdata;
2:920GB:920GB:1049kB:::bios_grub;
3:920GB:1476GB:556GB:ntfs:Basic data partition:msftdata;
4:1476GB:1800GB:324GB:ntfs:Basic data partition:msftdata;


Free space >10MiB: ______________________________________________________________


sda: 404779MiB:451189MiB:46410MiB
sdb: 1716956MiB:1907729MiB:190773MiB


blkid (filtered): ______________________________________________________________


NAME   FSTYPE   UUID                                 PARTUUID                             LABEL             PARTLABEL
sda                                                                                                         
├─sda1 vfat     4887-94F5                            02efc03c-0d0c-43a9-966e-a6ad53c9edc5 ESP               EFI system partition
├─sda2                                               f1410272-14bb-4f7d-902e-00c6476614da                   Microsoft reserved partition
├─sda3 ntfs     CAB25579B2556B49                     f6803be0-038e-4009-b1b4-00e11a35631b OS                Basic data partition
├─sda4 ntfs     E6BA3670BA363CFD                     6a32a8f3-3407-4639-8ef8-23d8357c216d Vrac primary      Basic data partition
├─sda5 ntfs     0E029F42029F2DA9                     deca5c9e-e30b-4e86-bb82-db98815c1b35 WINRETOOLS        
├─sda6 ntfs     AEC4A02AC49FF2B7                     3e650648-465c-47f3-a779-7bf06125fb6d Image             
└─sda7 btrfs    d9350585-506b-4b2a-b402-eba8497ffdaf 2b15366a-c7a7-ef4a-bee8-6f65e8462058                   root
sdb                                                                                                         
├─sdb1 ntfs     0296F50996F4FDCB                     9d17a0a0-6488-4fb9-b86d-2538dbd4b36a Data              Basic data partition
├─sdb2                                               dd84a79c-1d3b-4e5e-a778-4eee6f623cba                   
├─sdb3 ntfs     FE0A058E0A05455D                     92cfda1c-bec8-433f-964b-0dc2796eb769 Games             Basic data partition
└─sdb4 ntfs     DE5ACB645ACB3853                     9a33b971-5eb6-40b9-b3f4-1479487d829d Save and Recovery Basic data partition


Mount points (filtered): _______________________________________________________


                        Avail Use% Mounted on
/dev/sda3               49.7G  75% /mnt/boot-sav/sda3
/dev/sda4               70.2G  55% /mnt/boot-sav/sda4
/dev/sda5              420.6M  49% /mnt/boot-sav/sda5
/dev/sda6               69.4M  99% /mnt/boot-sav/sda6
/dev/sda7               16.6G  56% /
/dev/sdb1              147.8G  83% /media/pfelelep/Data
/dev/sdb3              182.5G  65% /mnt/boot-sav/sdb3
/dev/sdb4                 42G  86% /mnt/boot-sav/sdb4
efivarfs                  41K  82% /sys/firmware/efi/efivars


Mount options (filtered): ______________________________________________________


/dev/sda3              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sda4              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sda5              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sda6              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sda7              btrfs           rw,relatime,ssd,discard=async,space_cache=v2,subvolid=5,subvol=/
/dev/sdb1              ntfs3           rw,nosuid,nodev,relatime,uid=1000,gid=1000,iocharset=utf8
/dev/sdb3              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096
/dev/sdb4              fuseblk         rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096


===================== sda1/efi/ubuntu/grub.cfg (filtered) ======================


search.fs_uuid d9350585-506b-4b2a-b402-eba8497ffdaf root hd0,gpt7 
set prefix=($root)'/boot/grub'
configfile $prefix/grub.cfg


====================== sda7/boot/grub/grub.cfg (filtered) ======================


Ubuntu   d9350585-506b-4b2a-b402-eba8497ffdaf
Windows Boot Manager (on sda1)   osprober-efi-4887-94F5
### END /etc/grub.d/30_os-prober ###
UEFI Firmware Settings   uefi-firmware
### END /etc/grub.d/30_uefi-firmware ###


========================== sda7/etc/fstab (filtered) ===========================


# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda7 during curtin installation
/dev/disk/by-uuid/d9350585-506b-4b2a-b402-eba8497ffdaf / btrfs defaults 0 1
# /boot/efi was on /dev/sda1 during curtin installation
UUID=4887-94F5  /boot/efi       vfat    defaults      0       1


======================= sda7/etc/default/grub (filtered) =======================


GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`( . /etc/os-release; echo ${NAME:-Ubuntu} ) 2>/dev/null || echo Ubuntu`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
GRUB_DISABLE_OS_PROBER=false


==================== sda7: Location of files loaded by Grub ====================


           GiB - GB             File                                 Fragment(s)
 202.592394829 = 217.531927552  boot/grub/grub.cfg                             1
 207.728102684 = 223.046351872  boot/vmlinuz                                   1
 207.728102684 = 223.046351872  boot/vmlinuz-6.11.0-8-generic                  1
 207.453169823 = 222.751144960  boot/vmlinuz-6.8.0-45-generic                  1
 207.453169823 = 222.751144960  boot/vmlinuz.old                               1
 223.713049889 = 240.210058240  boot/initrd.img                                2
 223.713049889 = 240.210058240  boot/initrd.img-6.11.0-8-generic               2
 208.734850883 = 224.127339520  boot/initrd.img-6.8.0-41-generic               2
 223.657198906 = 240.150088704  boot/initrd.img-6.8.0-45-generic               2
 223.657198906 = 240.150088704  boot/initrd.img.old                            2


===================== sda7: ls -l /etc/grub.d/ (filtered) ======================


-rwxr-xr-x 1 root root 18133 Apr  4  2024 10_linux
-rwxr-xr-x 1 root root 43202 Apr  4  2024 10_linux_zfs
-rwxr-xr-x 1 root root 14513 Apr  4  2024 20_linux_xen
-rwxr-xr-x 1 root root   786 Apr  4  2024 25_bli
-rwxr-xr-x 1 root root 13120 Apr  4  2024 30_os-prober
-rwxr-xr-x 1 root root  1174 Apr  4  2024 30_uefi-firmware
-rwxr-xr-x 1 root root   722 Apr  5  2024 35_fwupd
-rwxr-xr-x 1 root root   214 Apr  4  2024 40_custom
-rwxr-xr-x 1 root root   215 Apr  4  2024 41_custom

**tea for one** · October 17th, 2024

Code:

efibootmgr -v (filtered) after grub install
BootOrder: 0000
Boot0000* Ubuntu    HD(1,GPT,02efc03c-0d0c-43a9-966e-a6ad53c9edc5,0x800,0xfa000)/File(EFIubuntushimx64.efi)
Boot0003* Hard Drive    BBS

The Windows file is missing again.
You reported in post 8 that you fixed it, can you try the same command?

**oldfred** · October 17th, 2024

Normally the issue is UEFI erases Ubuntu entries. Most UEFI seem to auto find the /efi/Microsoft folder & add an UEFI boot entry for Windows, but not find any Linux installs.

Grub can only boot working Windows. If it boots from UEFI (after adding entry again) it may be it needs chkdsk or has turned fast startup back on. It often turns fast startup aback on with updates. Fast startup sets hibernation flag & then Linux NTFS driver will not fully read/write NTFS.
Or Windows could need other repairs, which only can be done from a Windows repair/recovery drive which you should always have or from a Windows install flash drive with a recovery/repair console.

**yancek** · October 17th, 2024

The EFI boot entry being missing is definitely a problem as mentioned in the last post. What happens when you set Boot0003* Hard Drive to first boot priority in the BIOS boot options? Does it still fail?

Boot repair does not 'repair' windows boot files, it simply creates a standard menuentry for windows. If windows boot files are missing from their expected location or are damaged you will need to use some windows software to repair it.

In your last post, you show the output of sudo update-grub which indicates that it did find windows and create an entry for it so go into the /boot/grub/grub.cfg file and find the menuentry for windows and post it here. You should have an entry similar to the below entries which is a standard entry and has what shows as your UUID for the EFI partition in your boot repair output . You could copy them there to test and if that fails, it is likely or windows boot files are corrupted.

menuentry 'Windows' {
search --fs-uuid --set=root 4887-94F5
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
menuentry 'Windows'{
search --no-floppy --fs-uuid --set=root 4887-94F5
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

**pfelelep** · October 17th, 2024

@yancek

go into the /boot/grub/grub.cfg file and find the menuentry for windows and post it here.

here it is:

Code:

menuentry 'Windows Boot Manager (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-efi->        insmod part_gpt
        insmod fat
        set root='hd0,gpt1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ah>
        else
          search --no-floppy --fs-uuid --set=root 4887-94F5
        fi
        chainloader /EFI/Microsoft/Boot/bootmgfw.efi

@tea for one

You reported in post 8 that you fixed it, can you try the same command?

Yes, that should bring windows again.

@oldfred:

If it boots from UEFI (after adding entry again) it may be it needs chkdsk or has turned fast startup back on.

It didn't turn the fastboot ON last time, but I will check again and also do a chkdsk.

Thread: [SOLVED] problem with dual boot ubuntu/w10 at GRUB: cannot load image

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