Ajouter au sources.list:
deb http://download.virtualbox.org/virtualbox/debian hardy non-free
deb http://download.virtualbox.org/virtualbox/debian gutsy non-free
deb http://download.virtualbox.org/virtualbox/debian dapper non-free
deb http://download.virtualbox.org/virtualbox/debian lenny non-free
deb http://download.virtualbox.org/virtualbox/debian etch non-free
deb http://download.virtualbox.org/virtualbox/debian sarge non-free
Installer la clef du dépôt :
$ wget -q http://download.virtualbox.org/virtualbox/debian/sun_vbox.asc -O- | sudo apt-key add -