I found some of the related bugs when I experienced several of the mentioned symptoms (restart button doesn't work, Ubuntu Software Center doesn't work, can't open users-admin, etc). I'd just like to report that #26 fixed all the problems.
I was experiencing said problems on a fresh install of Natty. I'm not sure when the problem started, but I think it was from the beginning. If there's any more information I can provide, let me know. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/295405 Title: Fails to run lib/dbus-1.0/dbus-daemon-launch-helper: not owned by the messagebus group -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs