Failed to fetch http://medibuntu.sos-sts.com/repo/dists/feisty/free/binary-i386/Packages.gz 302 FoundFailed to fetch http://medibuntu.sos-sts.com/repo/dists/feisty/free/source/Sources.gz 302 Found
Main Gnome Menu -> System -> Administration -> Software Sources -> Third Party Software tab -> Untick anything starting http://medibuntu