GRand Unified Bootloader (GRUB) is a common boot tool used in Linux distros. It handles loading Linux and other operating systems.
I've come across hard disk trouble a few times that were solved by reinstalling GRUB. For example on booting getting a GRUB prompt with a
no such partition error.
This has typically had to be done via booting with the Arch Linux install USB because it was impossible to boot otherwise. The process is the same as the initial install.
The process is:
lsblkto get locations of disks.
as applicable. - Usearch-chroot
to get into the mounted stuff and install GRUB as normal, eg: -grub-install –target=x86_64-efi –efi-directory=/efi –bootloader-id=GRUB
-grub-mkconfig -o /boot/grub/grub.cfg''