HowTo: Upgrade Debian 5.0 (Lenny) To Debian 6.0 (Squeeze) last updated February 6, 2011 in Categories Debian / UbuntuDebian 6.0 “Squeeze” has been released and how do I upgrade to Debian GNU/Linux 6.0 from the previous release, Debian GNU/Linux 5.0 (“Lenny”) using command prompt?