My "administrative" user experienced the same symptoms after upgrading the 80 packages that were updated since Apr 11. Invoking the "Windows" Preferences gave a popup "Cannot start the preferences application for your window manager", "Window manager "unknown" has not registered a configuration tool. Removing the ~/.gnome2 directory made the symptoms disappear. Root did not experience the problem.
-- Metacity crash corrupts future Gnome sessions https://bugs.launchpad.net/bugs/106350 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs