Repair, Restore, or Reinstall Grub 2 with a Mint Live CD or USB

grub2 repair

if you have 64bit linux mint, you need 64bit live cd

sudo mount /dev/sdXY /mnt

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

sudo chroot /mnt

grub-install /dev/sdX
grub-install --recheck /dev/sdX

update-grub

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