mkdir /mnt/root
mount -t ext3 /dev/sda6 /mnt/root
mount -o bind /dev /mnt/root/dev
chroot /mnt/root /bin/bash
grub-install /dev/sda
mkdir /mnt/root
mount -t ext3 /dev/sda6 /mnt/root
mount -o bind /dev /mnt/root/dev
chroot /mnt/root /bin/bash
grub-install /dev/sda