Though Ubuntu dapper is supported till 2011, this Repository won't cary packages any newer than 7.37; dependency hell got us; this version is too ancient. If you want to upgrade your Dapper to more recent citadels, read http://www.citadel.org/doku.php/faq:installation:compile_debs There may be some things you can do by modifying debian/control and friends to be less strict.