This is what can be found in my journald with X2go debug logging enabled:
Feb 03 13:16:48 workstation64 /usr/bin/x2gocmdexitmessage[29768]: command output starts with: exec startxfce4 Feb 03 13:16:48 workstation64 polkitd[12266]: Unregistered Authentication Agent for unix-session:116 (system bus name :1.228 [/usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1],object path /org/gnome/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
Any idea why X2go doesn't use client or host locale but unwanted reads that Polkit stuff?
-Andy