Grub2 rewrite from liveDVD

jago25_98 · 05-04-2011, 09:25 PM

Made a mistake with /etc/default/grub
...
now nothing will boot.

So I need to edit that file and update-grub.

But if I chroot to the / from a liveCD I get
"/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?)."

How do I change grub if I can't get to it (set the menu to 0 by mistake)

andrewthomas · 05-04-2011, 09:36 PM

Use this to chroot.

Make sure that you replace /dev/sdXy with the correct disk and partition

Code:

#! /bin/bash
sudo mount /dev/sdXy /mnt/
sudo mount --bind /proc /mnt/proc
sudo mount --bind /dev /mnt/dev
sudo mount --bind /dev/pts /mnt/dev/pts
sudo mount --bind /sys /mnt/sys
chroot /mnt/ /bin/bash

sudo umount /mnt/sys
sudo umount /mnt/dev/pts
sudo umount /mnt/dev
sudo umount /mnt/proc
sudo umount /mnt/