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A friend of mine is running Ubuntu and got GRUB RESCUE. Can they use Mint ISO to repair their Grub? As I don't have Ubuntu ISO?

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I guess yes, you can checkout this ubuntuhandbook.org/index.php/2013/11/… – beginer Sep 1 '14 at 13:31
up vote 6 down vote accepted

If the Ubuntu installation is still present (and only GRUB was lost), sure, you can use any distro that has live booting to do so. chroot into the Ubuntu installation and install and update Grub. If /dev/sda5 is the Ubuntu partition:

mount /dev/sda5 /mnt
mount -o bind /dev /mnt/dev
mount -t proc none /mnt/proc
mount -t sysfs none /mnt/sys
mount -t devpts none /mnt/dev/pts
chroot /mnt /bin/bash
#Inside the chroot
grub-install /dev/sda
# Unmount all those mounts:
for m in /mnt/{dev/pts,dev,proc,sys,}; do umount $m; done
# reboot

If all you need to do is install grub, and updating isn't necessary, then you don't need the chroot:

mount /dev/sda5 /mnt
grub-install --root-directory=/mnt /dev/sda

If you have a separate boot partition, remember to mount it as well, after mounting /mnt.

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Since grub is standard boot loader, you can use any distro that uses grub as its bootloader.

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