Starting with Ubuntu Karmic, Grub2 is used (for clean installs for now), so THIS how-to on recovering the GRUB no longer works for the new GRUB2.
But recovering GRUB2 (after breaking the GRUB2 or installing Windows - which breaks GRUB2, etc.) is just as easy. Here is what you need to do
Note: This tutorial should work for any Linux distribution which uses GRUB2, not just Ubuntu.
Read more »