I already had Ubuntu 12.04 LTS and Windows 7 on my hard drive, then I installed Backtrack on another partition. Now after installation when I reboot, the boot menu entry of Ubuntu 12.04 is gone. I only see entries for BT and Win 7. Ubuntu 12.04 is still there, as I can see it's file system intact.
Things I tried:
Manually editing grub. But it seems
/initrd.imgare broken links. Manual editing grub files was a pain and didn't work.
Used boot-repair to try to repair grub. Thought it worked but it's the same result at the end. I see BT and win 7 but not Ubuntu 12.04 entry.
Here is the boot-repair results file: http://paste2.org/p/2806011