It also happens when connecting directly to internet. There's a workaround posted here: http://ubuntuforums.org/showpost.php?p=12337687&postcount=3
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1084843 Title: "Install additional software " button doesn't find required plugin when behind proxy To manage notifications about this bug go to: https://bugs.launchpad.net/sessioninstaller/+bug/1084843/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs