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[How To] Fix Grub with a Ubuntu Live CD

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Haggis    1,008

Mount the partition your Ubuntu Installation is on. If you are not sure which it is, launch GParted (included in the Live CD) and find out. It is usually a EXT4 Partition. Replace the XY with the drive letter, and partition number, for example: sudo mount /dev/sda1 /mnt.

sudo mount /dev/sdXY /mnt

Now bind the directories that grub needs access to to detect other operating systems, like so.

sudo mount --bind /dev /mnt/dev &&
sudo mount --bind /dev/pts /mnt/dev/pts &&
sudo mount --bind /proc /mnt/proc &&
sudo mount --bind /sys /mnt/sys

Now we jump into that using chroot.

sudo chroot /mnt

Now install, check, and update grub.
This time you only need to add the drive letter (usually a) to replace X, for example: grub-install /dev/sda, grub-install ?recheck /dev/sda.

grub-install /dev/sdX 

grub-install --recheck /dev/sdX 

update-grub

Now grub is back, all that is left is to exit the chrooted system and unmount everything.

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

Shut down and turn your computer back on, and you will be met with the default Grub2 screen.

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Seahorsepip    610

When I broke grub, I always used http://www.supergrubdisk.org/, saved me a lot of hassle when my pc didn't want to boot anymore after tweaking it too much :P

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