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sudo mount /dev/sda5 /mnt

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

# sudo mount /dev/sdaX /mnt/boot

sudo chroot /mnt
sudo grub-install --root-directory=/mnt /dev/sda
sudo update-grub
exit

sudo umount /mnt/dev
sudo umount /mnt/sys
sudo umount /mnt/proc
sudo umount /mnt/boot #Only if you mounted it earlier
sudo umount /mnt/