GRUB Bootloader Reinstall

Updated 2,010 Days AgoPublic

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Oh no, GRUB kicked the bucket! Luckily for you, your professor just went over Frankenstein last week, so you can say that you're somewhat of an expert with reviving the dead. :^)

1 - Boot into a live Linux disk
2 - Open a terminal: ( ⌃ + ALT + T )
3 - Become root sudo su
4 - Run fdisk -l to find out where Linux is installed in the drive you're working on. It should look something like so:

mount --bind /proc /mnt/proc 
mount --bind /sys /mnt/sys 
mount --bind /dev /mnt/dev

6 - Now we want to work inside of what we've mounted, ergo: chroot /mnt
7 - Reinstall GRUB:

grub-install /dev/sdX
update-grub /dev/sdX
update-grub2 /dev/sdX

NOTE: in this case, we're installing it to /dev/sda

8 - Unmount everything previously mounted:

umount /mnt/proc
umount /mnt/sys
umount /mnt/dev
umount /mnt

9 - Revel in the fruits of your labor and reboot