~# grub-install /dev/sda --boot-directory=/mnt/boot
Installing for i386-pc platform.
Installation finished. No error reported.
root@anirbaan-desktop:~# grub-mkconfig -o /mnt/boot/grub/grub.cfg 
/usr/sbin/grub-probe: error: failed to get canonical path of `/cow'.
root@anirbaan-desktop:~# update-grub
/usr/sbin/grub-probe: error: failed to get canonical path of `/cow'.