On Sun, 29 Dec 2024 11:07:18 -0800
Peter Ehlert <pe...@sdi-baja.com> wrote:

> On 12/29/24 08:26, Eben King wrote:
> > I think I've done everything reasonable in my firmware to ensure
> > booting by EFI.  I have:
> >
> > Storage boot option control      UEFI only
> > Other PCI device ROM priority    UEFI only
> > (other options for both are "Legacy only" and "Disabled")  
> maybe this will help.
> Debian, and others show in GRUB, but not windows 10.
> HP workstation: I press F9 on boot for a boot menu
> I get a listing:
> UEFI - debian
>  >other systems<  
> UEFI - Windows Boot Manager
> 
> It boots fine.
> Restart and I get GRUB, but without a windows option
> 
> 
If you run update-grub, do you see a warning that os-prober will not be
executed? After installation or upgrade to grub, os-prober is disabled
and will not detect Windows or any other OS that may be installed.

https://forum.manjaro.org/t/grub2-why-is-os-prober-now-disabled-by-default/57599

The answer is to modify /etc/default/grub and run update-grub again:

 To restore the old behavior, open a terminal and issue sudo echo
 GRUB_DISABLE_OS_PROBER=false >> /etc/default/grub && sudo update-grub

Note that you will need to do this again when grub is upgraded.

-- 
Joe

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