sudo gedit /etc/apt/sources.list
deb http://ppa.launchpad.net/backbox/two/ubuntu natty main
deb-src http://ppa.launchpad.net/backbox/two/ubuntu natty main
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 78A7ABE1
sudo apt-get install backbox-menu-gnome