Re: grub-uninstall

[Pascal Hambourg]

Le 08/11/2022 à 12:00, Narcis Garcia a écrit :
> My mistake was to do "grub-install /dev/sda" when I need to boot from 
> /dev/sdb
>
> Now I've done "grub-install /dev/sdb" but I don't want GRUB messages 
> appear on /dev/sda when BIOS boot goes there. It's confusing.
>
> I want to know how to revert actions done by grub-install on first disk 
> sectors, without losing partitions.

AFAIK, grub-install does not back up copy the original contents of 
sectors the boot image and core image are written to. So the best you 
can do is overwrite GRUB's boot image in the MBR with another boot 
program, e.g. with install-mbr from package "mbr".