Please see this post:

http://ubuntuforums.org/showthread.php?t=2321892

Could I suggest look at:

Code:
sudo gedit /etc/X11/Xwrapper.config
and change

Code:
allowed_users=console

to

allowed_users=anybody
the above from : https://www.maketecheasier.com/run-m...virtualization

regards..