[SOLVED] Update to grub-2.06 using grub-install on a uefi system.

Daedra · 06-15-2021, 02:49 PM

My grub menu is still showing 2.04, which makes sense to me because I figure I need to re-run grub-install to get grub upgraded to the newest version on my system. However I have only ever installed grub during the post slackware install. I have never done it on a working system. Can anyone explain the steps to reinstall grub using grub-install on a working system. I have a pretty good understanding on how to do this, but I don't want to overlook anything and be left unable to boot.

Daedra · 06-15-2021, 05:29 PM

Nevermind I got it, For anyone wanting to know this is how you can update your grub binaries by re running grub-install on a working system. This information assumes your using UEFI and not Bios, and your on a x86_64 install.

1) Boot the -current install disc in uefi mode. Then launch the first entry for the Slackware 15 installer.
2) After selecting your keyboard layout and logging in as root type "lsblk" to list your drives and partitions.
3) mount your existing slackware installation, efi directory, and other directory's so you can make changes to the installed system, then chroot into the new system and re-run grub-install like this...

Code:

mount /dev/<slackware_install_partition> /mnt
mount /dev/<efi_directory_partition> /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do mount -B $i /mnt$i; done
chroot /mnt /bin/bash
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grub
grub-mkconfig -o /boot/grub/grub.cfg

4) If you got no errors on the above then type exit and reboot.

EDIT

So I didn't realize I could just upgrade using grub-install on the running system. So the above information would only be relevant if you couldn't boot slackware and needed to reinstall grub.