How to change primary group

Question

I want to remove user pserver from the group apache.

#deluser pserver apache
/usr/sbin/deluser: You may not remove the user from their primary group.

Now I want to add a new primary group.

#usermod -G pserver pserver

pserver is now in group pserver

#groups pserver
pserver : apache pserver

Now I want to remove the user again from group apache, but I get same error again. How can I delete pserver from the primary group apache?

Answer 1

The usermod option -G adds supplementary groups. You want option -g to change the primary group. I.e.:

# usermod -g pserver pserver

This will also change group ownership of files in the home directory, but not elsewhere.