From Bugzilla Helper:
User-Agent: Mozilla/5.0 Galeon/1.2.6 (X11; Linux i686; U;) Gecko/20020916

Description of problem:
Useradd will not add a user to the system when using the -n flag if
a group named after the user exists in /etc/group.

On line 1817 of useradd.c, useradd performs a check to see if there
is a group which corresponds to the username specified and exits 
if there is one. In the case where there is a group named after 
the user, -n is specified, and the default group (in 
/etc/default/useradd) is something else (say, groupid 100), useradd 
will not add the user and exits with the error: 

useradd: group <whatever> exists - if you want to add this user to that group,
use -g.

Since we're using the -n flag, this shouldn't be relevant. This
upsets some automated scripts, which are expecting the documented 
behaviour.





Version-Release number of selected component (if applicable):
shadow-utils-4.0.3-6

How reproducible:
Always

Steps to Reproduce:
1. Add a group named 'foobar' (with gid=200 for example)
2. Add the line 'GROUP=80' to /etc/default/useradd (add a gid of 80 if there
isn't one)
3. Try to add a user with the default gid of 80 to the system:
   useradd -n foobar

    

Actual Results:  Got the error message:

useradd: group foobar exists - if you want to add this user to that group, use -g.

Expected Results:  User should have been added with default group 80.

Additional info:

This error was not present in 7.3 (shadow-utils-20000902-7)