(Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

globetrotterdk · 2021-10-23 09:25

Grub refuses to detect the Windows boot loader in connection with my Q4OS Gemini install. I have tried running

# grub-mkconfig -o /boot/grub/grub.cfg
# update-grub

but that doesn't seem to help. Any ideas?

Last edited by globetrotterdk (2021-10-27 17:53)

q4osteam · 2021-10-23 10:09

Please run:
$ sudo os-prober
and post the output here.

globetrotterdk · 2021-10-23 15:19

Thanks for the quick reply.

$ sudo os-prober
/dev/nvme0n1p2@/efi/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi

q4osteam · 2021-10-23 16:38

Well, now run:
$ sudo update-grub -o /tmp/grub-test.cfg
post output and attach the generated file "/tmp/grub-test.cfg" here.

globetrotterdk · 2021-10-23 18:48

OK, here is the file.

Attachments:

grub-test.cfg, Size: 7.15 KiB, Downloads: 285

q4osteam · 2021-10-23 22:53

The correct Windows menu item appears to be available in grub.cfg. Is the Grub boot table displayed ? What does the early boot process print on the screen ?

Please edit the "/etc/default/grub", search and set the following variables:

GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=10

Furthermore run in terminal:
$ sudo update-grub
Reboot and check the result.

globetrotterdk · 2021-10-24 07:58

Not sure what a Grub boot table is. Do you mean Grub boot menu? If so, the answer is, yes.
I get the following errors:

error: no such device: 8A70-33E6
error: `/efi/Microsoft/Boot/bootmgfw.efi` not found

I edited "/etc/default/grub" as recommended, but no change in the results.

globetrotterdk · 2021-10-27 17:50

After having backed up the M.2 SSD and then migrated the backup to a new, larger M.2 SSD, as well as updating Windows 10, and running:

$ sudo grub-mkconfig -o /boot/grub/grub.cfg
$ sudo update-grub

again, Grub menu seems to be working fine now.

globetrotterdk · 2021-10-27 17:52

Windows 10 appears to be working fine on the new M.2 SSD. My problem with the Grub menu also appears to have disappeared after updating Windows 10.

Q4OS Forum

#1 2021-10-23 09:25

(Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

#2 2021-10-23 10:09

Re: (Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

#3 2021-10-23 15:19

Re: (Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

#4 2021-10-23 16:38

Re: (Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

#5 2021-10-23 18:48

Re: (Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

#6 2021-10-23 22:53

Re: (Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

#7 2021-10-24 07:58

Re: (Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

#8 2021-10-27 17:50

Re: (Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

#9 2021-10-27 17:52

Re: (Solved) Grub refuses to detect Windows bootloader - Q4OS Gemini.

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