I am experiencing this same problem; running it through Gnome Control Center leads to a crash similar to what's been reported. However, running it from the commandline via `sudo update-manager` works without issue, except for the following warnings printed on the console:
warning: could not initiate dbus current dist not found in meta-release file -- update-manager crashed in feisty https://launchpad.net/bugs/79274 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
