Martin,
In gnome-system-tools found bug #236305 "Creating user with username 'admin' hoses admin group, sudo config", that describes exactly what I faced. Re-posted there, thanks for your reply.
Martin,
In gnome-system-tools found bug #236305 "Creating user with username 'admin' hoses admin group, sudo config", that describes exactly what I faced. Re-posted there, thanks for your reply.