I tested this using Intrepid and confirm that gnome-system-tools version 2.22.1-0ubuntu1.1 does infact prevent the creation the of a user named admin and various others. Its a bit odd that the error message says the user already exists, but its the functionality that is the key.
-- Creating user with username 'admin' hoses admin group, sudo config https://bugs.launchpad.net/bugs/236305 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-system-tools in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs