Re: UEFI: can running grub-install help after a motherboard change?

[Pascal Hambourg]

Le 22/02/2022 à 20:54, Sébastien Hinderer a écrit :
> Given that running grub-install had already been done with my former
> motherboard, does it make sense to run it again with the new
> motherboard? Does grub-install somehow interact with the motherboard to
> let it know it supports UEFI mode?

Yes and yes. The normal way of booting in UEFI mode requires to 
"register" the boot loader in the EFI boot variables which are stored in 
the motherboard non volatile memory. EFI boot variables can be read and 
written with efibootmgr.

A way to not depend on EFI boot variables is to install the boot loader 
in the "removable media path". You can do it with

grub-install --removable

In Debian, you can use

grub-install --force-extra-removable

to install GRUB in both the normal location (and update EFI variables) 
and the removable media path.