As Sebastien pointed out on IRC, this could be because of having policykit 0.7 with policykit-gnome 0.6. That's what I have right now, and it's broken. I've just upgraded policykit-gnome to 0.7 and it fixes this bug.
** Changed in: gnome-system-tools (Ubuntu) Status: Incomplete => Triaged -- Users-admin unlock not working https://bugs.launchpad.net/bugs/183673 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