484 grub-install –root-directory=/boot /dev/sda
485 mount /dev/
486 cat /etc/fstab
487 blkid
488 ls
489 update-grub2
490 grub-install /dev/sda3
491 grub-install –recheck /dev/sda3
492 grub-install /dev/sda
493 grub-install –recheck /dev/sda