Comment # 31 on bug 1166743 from Ancor Gonzalez Sosa

(In reply to S. B. from comment #30)
> Hi there, I'm glad to see this is being worked on. Would it also be possible
> to make YaST Users respect the GROUPS=  parameter in /etc/default/useradd ?
> Or should I open a new feature request for this? Thanks!

Quite the opposite. We intentionally modified YaST to stop honoring that
parameter.

The goal was to align useradd and YaST as much as possible, with YaST basically
just invoking useradd to do the real job of creating users. And useradd has
completely ignored the GROUPS= parameter in /etc/default/useradd for years (the
last version that honored it was the one in openSUSE 11.3).

So now YaST ignores the GROUPS= settings just like useradd does. That's on
purpose.