x2go does not work on ubuntu 13.10 server
.  Tried installing gnome-session-fallback (old and replaced with flashback) and gnome-session-fallback using both of those parameters in the custom desktop command line and all I get is a blank screen.  x2go connects but the screen is black.  FYI Using x2go client with x11quartz on a mac.  

Checking the logs during connection I get:

Jan 14 11:18:27 userver /usr/bin/x2gostartagent: successfully started X2Go agent session with ID
Jan 14 11:18:28 userver /usr/bin/x2goruncommand: launching session with Xsession-x2go mechanism, using STARTUP="/usr/bin/gnome-session"