Now I understand. I eliminated the problem by commenting out the problem section like so:
<!-- <Move> <Old>System</Old> <New>Utilities/System</New> </Move> --> -- Moving the System menu breaks the screensaver kcontrol module https://launchpad.net/bugs/46599 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
