Thank you for your bug. That's not a gnome-system-tools bug, users created by the installer or added by adduser are not member of that group neither. If you want to suggest a such change for the distribution the right place is the ubuntu-devel (or ubuntu-devel-discuss first maybe) list (very few people read bugs compared to the mailing list)
** Changed in: gnome-system-tools (Ubuntu) Importance: Medium => Wishlist Assignee: (unassigned) => Ubuntu Desktop Bugs Status: Unconfirmed => Rejected -- Adding user with the administrator profile does not add them to the 'users' group https://launchpad.net/bugs/27855 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs