sudo mount --bind /dev/pts /media/x/LUBUNTU\ 13.10/dev/pts
sudo mount --bind /sys /media/x/LUBUNTU\ 13.10/sys
sudo mount --bind /dev /media/x/LUBUNTU\ 13.10/dev
sudo mount -t proc none /media/x/LUBUNTU\ 13.10/proc

chroot /media/x/LUBUNTU\ 13.10/
grub-install

update-grub

1116  umount /media/x/LUBUNTU\ 13.10/{dev/pts,dev,sys,proc,}