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This is steps you might need to consider if you messed up your GRUB. Firstly, you will need to download the latest Ubuntu LiveCD and boot it.

Mount Disk

• Open a terminal and type

$ sudo fdisk -l

• Now, you need to remember which device listed is your linux distribution, for reference, /dev/sda1 will be used. Now we need to mount the filesystem to /mnt

$ sudo mount /dev/sda1 /mnt

• If you have /boot on a separate partition, that need’s to be mounted aswell. For reference, /dev/sda2 will be used.

$ sudo mount /dev/sda2 /mnt/boot Make sure you don’t mix these up, pay attention to the output of FDISK

• Now mount the rest of your devices

$ sudo mount –bind /dev /mnt/dev

• Now chroot into your system

$ sudo chroot /mnt

You should be chroot’d into your system as root, you can now run commands as root, without the need for sudo.

Edit Grub

• Now you need to edit the /etc/default/grub file to fit your system

$ nano /etc/default/grub

• When that is done you need to run update-grub to create the configuration file.

$ update-grub

• To install GRUB 2 to the MBR, next you need to run grub-install /dev/sda

$ grub-install /dev/sda

• If you encounter any errors, try grub-install –recheck /dev/sda

$ grub-install –recheck /dev/sda

Unmount Disks

• Press Ctrl+D to exit out of the chroot. Once you exit back to your regular console, undo all the mounting, first the /dev

$ sudo umount /mnt/dev

• Now you can unmount the root system

$ sudo umount /mnt

And you should be free to restart your system right into GRUB 2 and then into your system installation.

If you had alternate OS entries, update-grub might say “Cannot find list of partitions!”. Ignore it and continue – once you can boot into your linux installation, do so and then rerun update-grub and grub-install /dev/sda as root.

Reference:

1. http://tinyurl.com/yemosva