I found solution on Ubuntuforums: http://ubuntuforums.org/archive/index.php/t-863742.html
-- upgrade app will not function https://bugs.launchpad.net/bugs/376452 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
