GRUB 2 Recovery In Linux

We often come across a condition in which the boot loader gets corrupt. Here are a few steps that will help you recover your GRUB 2 boot loader.
Boot from a live CD or DVD, which supports GRUB 2 ([highlight1]Ubuntu 9.10 CD or above[/highlight1]. A DVD will take more time than a CD, so I suggest you boot from a CD).
Open the terminal and run fdisk -l to check the partition from which you want to recover GRUB 2.
Here I assume that you want to recover it from /dev/sda1.
Then run the following commands:

$sudo mkdir /media/sda1

$sudo mount /dev/sda1 /media/sda1

$sudo mount –bind /dev /media/sda1/dev

$sudo mount –bind /proc /media/sda1/proc

Now chroot into that partition by running the command given below:

$sudo chroot /media/sda1

Then re-install GRUB, as follows:

#grub-install /dev/sda

The output should be like what’s shown below:

Installation finished. No error reported.

If you get an error, then try the following command:

#grub-install –recheck /dev/sda

[highlight2]After a successful installation, exit from chroot and unmount the file systems that were mounted to recover GRUB. Now reboot.[/highlight2]


$sudo umount /media/sda1/proc

$sudo umount /media/sda1/dev

$sudo umount /media/sda1

$sudo reboot

You’ve successfully completed, recovering of GRUB boot loader.

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