grub2-install добавлено пользователем evilman_work. permanent link
mount -o bind /sys /newroot/sys && mount -o bind /dev /newroot/dev && mount -o /proc /newroot/proc && chroot /newroot , grub2-install --boot-directory=/boot /dev/sdX
CalcScript v. 1.1
Author: mdma special for #linux channel on RusNet. 2011