GruBoot - simple tiny dummy boot helper for the GTK-based desktop environments
    based on grub2 features to booting in any another already installed
    [detected] OS on your drive, but only at the next time.
    It's not doing something special;
    in fact, it has no super-duper features:
    it's just some kind a proof-of-concept app.

Packages for Ubuntu can be found at this PPA:
http://launchpad.net/~iaz/+archive/gruboot