Package: (Ubuntu server) x2goserver_4.0.1.19-0~1064~ubuntu14.04.1
Version: 4.0.1.19-0~1064

The name of shell variable ${STARTUP} defined by x2goserver is too common.
> $ echo $STARTUP
> /usr/bin/dbus-launch --exit-with-session /usr/bin/im-launch /usr/bin/env LD_LIBRARY_PATH=/usr/lib/nx/X11/Xinerama:/usr/lib/nx/X11 xfce4-session

It would easily cause conflicts with other things. (Took me a week to debug :()

Could you please consider changing it to some more specific name like "X2GO_STARTUP"?

Thanks!