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mkdir /mnt/dir
mount /dev/sdax /mnt/dir
mount --bind /dev /mnt/dir/dev
mount --bind /proc /mnt/dir/proc
mount --bind /sys /mnt/dir/sys
chroot /mnt/dir
grub-install /dev/sda
exit
umount /mnt/dir/dev
umount /mnt/dir/proc
umount /mnt/dir/sys
umount /mnt/dir