Cannot chain-load into Windows with GRUB.

Vastoren · Yesterday 17:34:21

Greetings all,

I've been dealing with this for a few weeks and I can't seem to get GRUB to chain-load my Windows install. I'm able to boot from the Windows drive itself, but not if I chain-load from GRUB.

Here is my lsblk -f

user:~$ lsblk -f

NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS

sda

├─sda1 ext4 1.0 b37991d8-cfe8-4f6b-b5f5-0cab0379e742 739.3M 17% /boot

├─sda2 vfat FAT32 4CE6-20FB 1021.8M 0% /boot/efi

└─sda3 btrfs 41e5700c-8559-4fe0-ac8e-e6eeec8fafa3 428.1G 4% /home

/

nvme1n1

├─nvme1n1p1 vfat FAT32 C091-9545

├─nvme1n1p2

├─nvme1n1p3 ntfs 0E84CD5C84CD4745 506.6G 47% /mnt/other

└─nvme1n1p4 ntfs C67AED5A7AED482F

user:~$

Windows is on the nvme1n1 drive.

I keep getting this error when I select my windows from the GRUB menu:

error: commands/search.c:grub_search_fs_uuid:371:no such device: C091-9545.
error: fs/fshelp.c:find_file:260:file '/efi/Microsoft/Boot/bootmgfw.efi' not found.

The odd part is, if I reinstall GRUB, then it works. Though if I try to boot into windows again it doesn't work. So only the first time does it properly chain-load into Windows.

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=GRUB

I've disabled fast startup, made sure there are no dirty bits on any drives and ran chkdsk in windows. No matter what I do I can't get it to properly chainload it. If I cd into the directory where it says it can't find bootmgfw.efi, it is actually there, which I find odd.

I've searched inside "/etc/grub/grub.cfg" for the windows entry and this is what I found:

if [ "$grub_platform" = "efi" ]; then
menuentry 'Windows Boot Manager (on /dev/nvme1n1p1)' --class windows --class os $menuentry_id_option 'osprober-efi-C091-9545' {
	insmod part_gpt
	insmod fat
	search --no-floppy --fs-uuid --set=root C091-9545
	chainloader /efi/Microsoft/Boot/bootmgfw.efi
}
fi

Which seems to be normal. So I am quite stumped as to why this won't boot.

/EFI/Microsoft/Boot/bootmgfw.efi

I've since tried a custom menuentry, by putting it in "/etc/grub.d/50_custom":

#!/bin/sh
exec tail -n +3 $0

menuentry "Windows Custom Entry" --hotkey=w {
  search --fs-uuid --set=root C091-9545
  chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

This also did not work and gave the same errors. Any help or advice is greatly appreciated.

Thank you in advance.

Last edited by Vastoren (Yesterday 17:38:00)

StarWolf3000 · Today 05:30:09

https://wiki.archlinux.org/title/GRUB#W … I/GPT_mode

Arch Linux

#1 Yesterday 17:34:21

Cannot chain-load into Windows with GRUB.

#2 Today 05:30:09

Re: Cannot chain-load into Windows with GRUB.

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