Here we are:
######################### root@noc /var/log/apt # sudo apt remove -s libnx-x11-6:amd64 libx2go-log-perl libx2go-server-db-perl libx2go-server-perl libx2go-utils-perl nx-x11-common nxagent x2goserver x2goserver-common x2goserver-x2goagent x2goserver-xsession Reading package lists... Done Building dependency tree Reading state information... Done Package 'x2goserver' is not installed, so not removed Package 'x2goserver-xsession' is not installed, so not removed You might want to run 'apt --fix-broken install' to correct these. The following packages have unmet dependencies: libxcompshad3 : Depends: libnx-x11-6 (= 2:3.5.99.23-1build1) but it is not going to be installed E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution). root@noc /var/log/apt # #########################
Now it's complaining about libxcompshad3. But I see the end of the tunnel, thanks to you, Stefan.
Again: your effort is really remarkable.