yancho@Ubuntu:~$ sudo startx
xauth:  creating new authority file /home/yancho/.serverauth.15171


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

Xlib: connection to ":0.0" refused by server
Xlib: Invalid MIT-MAGIC-COOKIE-1 key
giving up.
xinit:  unable to connect to X server
xinit:  No such process (errno 3):  Server error.
yancho@Ubuntu:~$