It only affects gdmsetup from my experience. Although I am not sure what causes it, something blocks it from opening the org.freedesktop.systemtoolsbackends.set authentication window.
To everyone out there who is not able to unlock users-admin (Tyson, Guido, Pedro, Neal) please try to answer the following: -Are/Were you on an upgraded system (9.04 -> 9.10) or a clean install on Ubuntu 9.10? -Have/Had you fully updated your system using Update Manager (If so, you should be running linux 2.6.31-16, run 'uname -r' to check) -- Cannot Unlock "System > Administration > Login Screen" https://bugs.launchpad.net/bugs/431147 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs