# mkdir /mnt/rootfs
# mount /dev/sdX /mnt/rootfs
# for i in dev proc sys ; do mount --bind "/$i" "/mnt/rootfs/$i"; done
chroot /mnt/rootfs
# grub-mkconfig -o /boot/grub/grub.cfg
# grub-install /dev/sdX
# exit
# umount /mnt/rootfs/{dev,proc,sys}
# umount /mnt/rootfs
# reboot
Не помогло
