kde overcomes this problem by adding '_#' to the usergroup in case it allready exists. (ie 'admin_1').
The same problem would btw arrise as soon as you add a new user with any name where a group with this name (gui<10000) already exists. So in any case gnome shoul first check, if the GUI allready exists and if so either error or name the group differently.
I think this is a quite dangerous bug, since it affects especially inexperienced users which rely on the gui. Destroying the user groups managment with a username should not be possible.
kde overcomes this problem by adding '_#' to the usergroup in case it allready exists. (ie 'admin_1').
The same problem would btw arrise as soon as you add a new user with any name where a group with this name (gui<10000) already exists. So in any case gnome shoul first check, if the GUI allready exists and if so either error or name the group differently.
I think this is a quite dangerous bug, since it affects especially inexperienced users which rely on the gui. Destroying the user groups managment with a username should not be possible.
best
Björn