Fixing Ubuntu 9.1 MBR GRUB 2 after Backtrack 4 Install

Posted by Zachary on Monday, April 5, 2010 / Labels:
After installing Backtrack 4 Final on my laptop I realized the grub it installed wasn't compatible with Ubuntu 9.1's ext4 filesystem that was in use.

So to fix this I used the Ubuntu 9.1 Live CD. Once booted I used the following...(assuming my Ubuntu partition was sda2)

sudo -i 
mount /dev/sda2 /mnt
grub-install --root-directory=/mnt/ /dev/sda

This will install Grub 2 to the MBR restoring Ubuntu 9.1 booting options. However it did erase Backtrack 4's boot option so that has to be manually restored.

In doing this I used the following command to list partitions and uuid information.

blkid

Remember that sda1 becomes hd0,0 or sdb3 becomes hd1,2. Since Grub counts starting with 0.

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