Thanks, Mihai.

Now we lost connection to that server, as per x2go client's message:

"Connection failed. bash: x2golistsessions: command not found"

Server side this is what we get:

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root@noc ~ # service x2goserver status
● x2goserver.service - LSB: Start and stop the X2Go daemon
     Loaded: loaded (/etc/init.d/x2goserver; generated)
     Active: failed (Result: exit-code) since Wed 2023-05-31 13:50:53 CEST; 1min 17s ago
       Docs: man:systemd-sysv-generator(8)
    Process: 1080 ExecStart=/etc/init.d/x2goserver start (code=exited, status=127)

May 31 13:50:53 noc systemd[1]: Starting LSB: Start and stop the X2Go daemon...
May 31 13:50:53 noc x2goserver[1080]:  * Cleaning up stale X2Go sessions
May 31 13:50:53 noc x2goserver[1080]: /etc/init.d/x2goserver: 26: x2gocleansessions: not found
May 31 13:50:53 noc systemd[1]: x2goserver.service: Control process exited, code=exited, status=127/n/a
May 31 13:50:53 noc systemd[1]: x2goserver.service: Failed with result 'exit-code'.
May 31 13:50:53 noc systemd[1]: Failed to start LSB: Start and stop the X2Go daemon.
#############################################

Also removing the package, with the intent to reinstall it from scratch, ends up with a failure:

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root@noc ~ # apt-get remove --purge x2goserver
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 libx2go-log-perl : Depends: x2goserver-common (>= 4.1.0.4-0~1975~ubuntu20.04.1) but 4.1.0.3-5 is to be installed
 libx2go-server-db-perl : Depends: x2goserver-common (>= 4.1.0.4-0~1975~ubuntu20.04.1) but 4.1.0.3-5 is to be installed
 libx2go-server-perl : Depends: libx2go-log-perl (< 4.1.0.3-5.1~) but 4.1.0.4-0~1975~ubuntu20.04.1 is to be installed
                       Depends: libx2go-server-db-perl (< 4.1.0.3-5.1~) but 4.1.0.4-0~1975~ubuntu20.04.1 is to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
#############################################

Is there anything we might do, to bring x2goserver back to normal/operative state?

Thanks in advance, and best regards, e.-