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ubuntu@ubuntu:~$ sudo mount /dev/sda3 /mnt
ubuntu@ubuntu:~$ sudo mount --bind dev /mnt/dev
mount: special device dev does not exist
ubuntu@ubuntu:~$ sudo mount --bind /dev /mnt/dev
ubuntu@ubuntu:~$ sudo mount --bind /proc /mnt/proc
ubuntu@ubuntu:~$ sudo mount --bind /proc /mnt/sys
ubuntu@ubuntu:~$ sudo chroot /mnt
root@ubuntu:/# grub-install /dev/sda
Installation finished. No error reported.
root@ubuntu:/# update-grub
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.2.0-23-generic-pae
Found initrd image: /boot/initrd.img-3.2.0-23-generic-pae
Found memtest86+ image: /boot/memtest86+.bin
Cannot find list of partitions!  (Try mounting /sys.)
done
root@ubuntu:/#