[X2Go-User] Ubuntu 16.04 break

After rebooting my server I am getting the following error message:

Connection failed. : /usr/lib/x2go/libx2go-server-db-sqlite3-wrapper insertsession 52 euler

and the command line shows as follows ]$ x2goclient QSocketNotifier: Can only be used with threads started with QThread x2go-WARNING-1> English language requested, not loading translator. x2go-WARNING-1> English language requested, not loading translator. QObject::connect: No such slot ONMainWindow::slotCheckAgentProcess() qt.qpa.wayland: Non-toplevel surfaces can't request window states

I do not know what happened. euler is the name of the ubuntu 16.04 machine.