Thanks for your bugreport. This can happen if the modification time of the sources.list is more recent than any file in /var/lib/apt/lists/. A apt-get update (or synatic relaod) does unfortunately not fix it as it uses the If- Modified-Since header and if the files did not change, then they will not the updated and the timestamp is the same.
A fix would be to make apt write a stamp file when it did its last update. ** Changed in: gnome-app-install (Ubuntu) Status: Unconfirmed => Confirmed -- List of available application is out of date... https://launchpad.net/bugs/70512 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs