[Cooker] strange behaviour of "adduser"

[Claudio]

No way to force "adduser" or "useradd" (which is the same) to create user 
with a default group on Mandrake 8.1
I changeg /etc/default/adduser
I got NO errors, but user is always created with as "user.user", no with 
"user.apache" or "user.somethingelse". It seems to be ok with userdrake 
instead... any hint about it???
I actually had to put alias adduser="adduser -g apache" in order to make it 
work... I don't think it's a good way to use it!
C.