E.g. Ubuntu Server offers only security updates for software contained in the main repository - how can I check, which installed packages are / are not in the main repo? Thanks!
You could use the Siduction Xfce Next repo:http://packages.siduction.org/?Reposito … _next_i386 | http://packages.siduction.org/?Reposito … next_amd64^These have the latest stable release of Xfce.The source.list line: deb http://packages.siduction.org/xfcenext unstable main$ wget http://packages.siduction.org/base/pool/main/s/siduction-archive-keyring...
Ubuntu linux uses software repositories to provide software packages and security updates to its users. There are a lot of mirrors situated all over the world, to offer better downloading speed for the users. To find the best repository server near you is a simple task, but could make your download speeds much better.