GRUB does not find efiboot

alnexus · 2022-02-25 19:46:10

I added a custom entry to the custom entry file of the grub config (40_custom.d or something like that) for Windows 10 but it does not work.

It looks like this:
menuentry "Windows 10" -class windows -class os {
insmod ntfs
search --no-floppy --set-root-fs-uuid 1A8C6E0C8C6DE32D chain loader (${root})/EFI/Microsoft/Boot/bootmgfw.efi
}

After I updated the config file with grub-mkconfig the entry shows up but whenever I try booting it I get "error: file/EFI/Microsoft/Boot/bootmgfw.efi' not found". It might me a problem inside Windows, I have no idea. I'm trying to startup Windows from the data partition (like C:/ itself, the UUID of that partition) but I have no idea what's going wrong. Am I supposed to try to boot from the EFI partition? I'm assuming not because I have reformatted the EFI partition a couple times and I ended up creating a new one because of... issues. Should I try to start it up from Windows reserved partition? (the first partition that isn't the C: drive partition on W10) or do I have to somehow boot into Windows and do something?

Slithery · 2022-02-25 20:02:08

alnexus wrote:

I'm trying to startup Windows from the data partition (like C:/ itself, the UUID of that partition)

That's your problem, you need to point grub to the bootmgfw.efi file on the EFI partition. If you've formatted this then you've deleted the files that Windows needs to boot (which is why the wiki tells you not to format it).
Try booting a Windows installation USB to see if they can be recovred.

alnexus · 2022-02-25 20:10:23

okay, makes sense. Thanks!
I'll finish up setting up my Arch to a usable state and then I'll manage that. I'll have to backup grub and reinstall it later if I do the Windows thing but that's fine. Thanks!

Arch Linux

#1 2022-02-25 19:46:10

GRUB does not find efiboot

#2 2022-02-25 20:02:08

Re: GRUB does not find efiboot

#3 2022-02-25 20:10:23

Re: GRUB does not find efiboot

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