x2goserver-4.1.0.0-0.0x2go1.0.git20171105.1438.heuler.fc26.x86_64
Okay, so in that case you probably haven't set the loglevel to debug in /etc/x2go/x2goserver.conf :
Nope been debug for a while now:
[log]
# possible levels are: emerg, alert, crit, err, warning, notice, info, debug
loglevel=debug