Grub: to get rid of os-prober

[roger64]

For the time being, everything is fine with my Grub using UEFI., os-prober being enabled. However, I lost confidence is os-prober. We had a big problem at the end of last month. Worse still, I can see that the “segmentation error”, though presently inocuous, has not yet been eliminated after more than a month, I think disaster could strike any time…

For this reason, I would like to ditch os-prober. This is easy to do , but first, as I have a dual boot (W10 and Linux), I’d like to write the Windows menu entry in the file /etc/grub.d/40_custom and I do not know how to write it. I think writing this entry, I would never lose this W10.

Could some knowledgeable person give me an example of a Windows menu entry?

[Stephane]

modify in /etc/default/grub
GRUB_DISABLE_OS_PROBER=true

sudo nano /etc/default/grub ( Ctrl+X and confirm save )

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

just update /etc/default/grub

[cactux]

@roger64

an example of a Windows menu entry?

@roger64

etc/grub.d/40_custom

For an example, look at: https://wiki.gentoo.org/wiki/GRUB/Chainloading
Go to the bottom of the page: Dual-booting Windows on UEFI with GPT
Adapt it to your setup. The UUID etc.

@roger64

I think writing this entry, I would never lose this W10.

Even without this, you should be able to start Windows from BIOS boot menu.

[manuel]

You can simply copy the Windows menuentry from file
/boot/grub/grub.cfg
to file
/boot/grub/custom.cfg

A menuentry is something like

menuentry 'Windows' {
    # contents
}

Tip: change the name of the Windows menuentry in custom.cfg to see you have another Windows entry at boot.

[cactux]

This is perhaps the more straightforward way than making a 40_custom.

[manuel]

I’m using this way. But nothing wrong with other ways, as long as one remembers what was done.

[roger64]

Thanks you for your replies.

Though the Gentoo wiki (thanks cactux) provides indeed a menu-entry for a W10 with UEFI, I used the solution of Manuel (thanks Manuel) which looks easier. It indeed created a new Windows2 entry, after that I could disable os-prober (thanks Stephane) . For good measure, I used both mk-config and grub-install, then I rebooted without os-prober and I am now left with Linux and W10.

Problem solved. Thanks to all!