ebian:/home/coolzero# su -c "X -configure"

Fatal server error:
Server is already active for display 0
        If this server is no longer running, remove /tmp/.X0-lock
        and start again.


When reporting a problem related to a server crash, please send
the full server output, not just the last messages.
Please report problems to submit@bugs.debian.org.

debian:/home/coolzero#