Techgage posted a tip about repairing a broken GRUB 2 boot-loader on Ubuntu

There's no question that GRUB 2 brought on numerous improvements over earlier versions, but it also introduced a small downside... a relative overhaul to how things are done. There are no more menu.1st (or similar) files that keep a simple configuration, nor are all of the commands the exact same at the command-line. You might have been an expert with GRUB 0.x, but you'll still face a small learning-curve with GRUB 2.

  Repairing a Broken GRUB 2 Boot-Loader on Ubuntu