grub2 - przywracanie, odzyskiwanie

sudo mkdir /mnt/root
sudo mount -t ext4 /dev/sda8 /mnt/root
sudo mount -o bind /dev /mnt/root/dev
sudo mount proc /mnt/root/proc -t proc
sudo mount sysfs /mnt/root/sys -t sysfs
sudo chroot /mnt/root
sudo grub-install /dev/sda
sudo update-grub (1,2)