grub repair

How toUbuntu

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Warning:

Using the sudo command, especially

from a Live CD can do serious damage to

your system. Read all instructions and

confirm you understand before executing

any commands. When pasting into the

Terminal, use Ctrl + Shift + V , NOT

Ctrl + V .

Terminal Commands:

Mount the partition your Ubuntu

Installation is on. If you are not sure which

it is, launch GParted (included in the Live

CD) and find out. It is usually a EXT4

Partition. Replace the XY with the drive

letter, and partition number, for example:

sudo mount /dev/sda5 /mnt .

How to Repair, Restore, or Reinstall Grub 2 with aUbuntu Live CD or USB

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Grub 2 typically gets overridden when you install Windows or another Operating System.

To make Ubuntu control the boot process, you need Reinstall (Repair/Restore) Grub using

a Ubuntu Live CD.

sudo mount /dev/sdXY /mnt

Now bind the directories that grub needs access to to detect other operating systems, like so:

How to Repair, Restore, or Reinstall Grub 2 with ... http://howtoubuntu.org/how-to-repair-restore-rein...

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sudo mount --bind /dev /mnt/dev && sudo mount --bind /dev/pts

/mnt/dev/pts && sudo mount --bind /proc /mnt/proc && sudo mount --bind

Now we jump into that using chroot .

sudo chroot /mnt

Now install, check, and update grub.

This time you only need to add the drive letter (usually a) to replace X, for example: grub-install

/dev/sda , grub-install –recheck /dev/sda .

grub-install /dev/sdX

grub-install --recheck /dev/sdX

update-grub

Now grub is back, all that is left is to exit the chrooted system and unmount everything.

exit && sudo umount /mnt/dev && sudo umount /mnt/dev/pts && sudo umount

/mnt/proc && sudo umount /mnt/sys && sudo umount /mnt

Shut down and turn your computer back on, and you will be met with the default Grub2 screen.

You may want to update grub or re-install burg however you like it.

Congratulations, you have just Repaired/Restored/Reinstalled Grub 2 with a Ubuntu Live CD!

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Commons license which requires suitableAttribution upon the reproduction of anywork, for Non-Commercial uses only. Italso requires you Share-Alike derivativeworks under the same or more liberallicense.

All article have been tested to work with Ubuntu 12.04, 12.10 and 13.04 unless otherwise noted.

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grub repair

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