Originally Posted by dragonslayer48dx
BTW- Grub is in the MBR, not the boot partition...
Actually its in both. stage1 is in the MBR and is just a small bit of code that loads stage2 which is found in /boot/grub. Stage2 is the program that displays the menu and all the other stuff that grub can do.
Having said that. Its my guess that the stage1 code was put in the MBR by the 2nd Ubuntu install. 1st thing on the list to do is put stage1 code back in the MBR that points to the stage2 program in the 1st ubuntu install.
Get a grub> prompt
Should return both stage2 locations looks like (hd0,2) (hd0,5) just an example. You need to figure out which one you need. Then lets say you want grub to boot stage2 in (hd05) you would do: (stiil from the grub> prompt)
reboot and see if that was the one. if not do it again with the other one.
Now you can figure out what to do with the space currenty use by Ubuntu install #2. But thats another question.