I think we're good.
So I went ahead, and what follows is the whole history:
############################
root@noc /var/log/apt # sudo apt remove 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 libxcompshad3
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
The following packages were automatically installed and are no longer
required:
libcapture-tiny-perl libconfig-simple-perl libdbd-pg-perl
libdbd-sqlite3-perl libdbi-perl libfile-which-perl libpq5 libswitch-perl
libxcomp3 lsof pwgen
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
libnx-x11-6 libx2go-log-perl libx2go-server-db-perl
libx2go-server-perl libx2go-utils-perl libxcompshad3 nx-x11-common
nxagent x2goserver-common x2goserver-x2goagent
The following held packages will be changed:
libx2go-log-perl libx2go-server-db-perl libx2go-server-perl
libx2go-utils-perl x2goserver-common x2goserver-x2goagent
0 upgraded, 0 newly installed, 10 to remove and 25 not upgraded.
2 not fully installed or removed.
After this operation, 7,260 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 162568 files and directories currently installed.)
Removing libx2go-server-perl (4.1.0.3-5) ...
Removing libx2go-server-db-perl (4.1.0.4-0~1975~ubuntu20.04.1) ...
Removing libx2go-log-perl (4.1.0.4-0~1975~ubuntu20.04.1) ...
Removing x2goserver-x2goagent (4.1.0.3-5) ...
Removing nxagent (2:3.5.99.23-1build1) ...
Removing libxcompshad3:amd64 (2:3.5.99.23-1build1) ...
Removing libnx-x11-6:amd64 (2:3.5.99.23-1build1) ...
Removing libx2go-utils-perl (4.1.0.3-5) ...
Removing nx-x11-common (2:3.5.99.23-1build1) ...
Removing x2goserver-common (4.1.0.3-5) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.9) ...
############################
Then the reinstall, via "sudo apt install x2goserver x2goserver-xsession":
############################
root@noc /var/log/apt # sudo apt install x2goserver x2goserver-xsession
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
libnx-x11-6 libx2go-config-perl libx2go-log-perl
libx2go-server-db-perl libx2go-server-perl libx2go-utils-perl
libxcompshad3 nx-x11-common nxagent x2goserver-common x2goserver-x2goagent
Suggested packages:
rdesktop
Recommended packages:
x11-xfs-utils x2goserver-extensions x2goserver-fmbindings
x2goserver-printing
The following NEW packages will be installed:
libnx-x11-6 libx2go-config-perl libx2go-log-perl
libx2go-server-db-perl libx2go-server-perl libx2go-utils-perl
libxcompshad3 nx-x11-common nxagent x2goserver x2goserver-common
x2goserver-x2goagent x2goserver-xsession
The following held packages will be changed:
x2goserver x2goserver-xsession
0 upgraded, 13 newly installed, 0 to remove and 25 not upgraded.
Need to get 2,295 kB of archives.
After this operation, 7,697 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
x2goserver-common all 4.1.0.3-5 [10.9 kB]
Get:2 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
libx2go-config-perl all 4.1.0.3-5 [5,508 B]
Get:3 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
libx2go-log-perl all 4.1.0.3-5 [5,584 B]
Get:4 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
libx2go-utils-perl all 4.1.0.3-5 [6,372 B]
Get:5 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
libx2go-server-db-perl amd64 4.1.0.3-5 [20.6 kB]
Get:6 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
libx2go-server-perl all 4.1.0.3-5 [11.7 kB]
Get:7 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
nx-x11-common all 2:3.5.99.23-1build1 [36.0 kB]
Get:8 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
libnx-x11-6 amd64 2:3.5.99.23-1build1 [594 kB]
Get:9 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
libxcompshad3 amd64 2:3.5.99.23-1build1 [42.4 kB]
Get:10 http://de.archive.ubuntu.com/ubuntu focal/universe amd64 nxagent
amd64 2:3.5.99.23-1build1 [1,469 kB]
Get:11 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
x2goserver-x2goagent amd64 4.1.0.3-5 [11.0 kB]
Get:12 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
x2goserver amd64 4.1.0.3-5 [74.4 kB]
Get:13 http://de.archive.ubuntu.com/ubuntu focal/universe amd64
x2goserver-xsession all 4.1.0.3-5 [8,044 B]
Fetched 2,295 kB in 0s (10.4 MB/s)
Preconfiguring packages ...
Selecting previously unselected package x2goserver-common.
(Reading database ... 162481 files and directories currently installed.)
Preparing to unpack .../00-x2goserver-common_4.1.0.3-5_all.deb ...
Unpacking x2goserver-common (4.1.0.3-5) ...
Selecting previously unselected package libx2go-config-perl.
Preparing to unpack .../01-libx2go-config-perl_4.1.0.3-5_all.deb ...
Unpacking libx2go-config-perl (4.1.0.3-5) ...
Selecting previously unselected package libx2go-log-perl.
Preparing to unpack .../02-libx2go-log-perl_4.1.0.3-5_all.deb ...
Unpacking libx2go-log-perl (4.1.0.3-5) ...
Selecting previously unselected package libx2go-utils-perl.
Preparing to unpack .../03-libx2go-utils-perl_4.1.0.3-5_all.deb ...
Unpacking libx2go-utils-perl (4.1.0.3-5) ...
Selecting previously unselected package libx2go-server-db-perl.
Preparing to unpack .../04-libx2go-server-db-perl_4.1.0.3-5_amd64.deb ...
Unpacking libx2go-server-db-perl (4.1.0.3-5) ...
Selecting previously unselected package libx2go-server-perl.
Preparing to unpack .../05-libx2go-server-perl_4.1.0.3-5_all.deb ...
Unpacking libx2go-server-perl (4.1.0.3-5) ...
Selecting previously unselected package nx-x11-common.
Preparing to unpack .../06-nx-x11-common_2%3a3.5.99.23-1build1_all.deb ...
Unpacking nx-x11-common (2:3.5.99.23-1build1) ...
Selecting previously unselected package libnx-x11-6:amd64.
Preparing to unpack .../07-libnx-x11-6_2%3a3.5.99.23-1build1_amd64.deb ...
Unpacking libnx-x11-6:amd64 (2:3.5.99.23-1build1) ...
Selecting previously unselected package libxcompshad3:amd64.
Preparing to unpack .../08-libxcompshad3_2%3a3.5.99.23-1build1_amd64.deb ...
Unpacking libxcompshad3:amd64 (2:3.5.99.23-1build1) ...
Selecting previously unselected package nxagent.
Preparing to unpack .../09-nxagent_2%3a3.5.99.23-1build1_amd64.deb ...
Unpacking nxagent (2:3.5.99.23-1build1) ...
Selecting previously unselected package x2goserver-x2goagent.
Preparing to unpack .../10-x2goserver-x2goagent_4.1.0.3-5_amd64.deb ...
Unpacking x2goserver-x2goagent (4.1.0.3-5) ...
Preparing to unpack .../11-x2goserver_4.1.0.3-5_amd64.deb ...
Unpacking x2goserver (4.1.0.3-5) ...
Preparing to unpack .../12-x2goserver-xsession_4.1.0.3-5_all.deb ...
Unpacking x2goserver-xsession (4.1.0.3-5) ...
Setting up x2goserver-common (4.1.0.3-5) ...
Group x2gouser already exists.
User x2gouser already exists.
usermod: no changes
Setting up libx2go-config-perl (4.1.0.3-5) ...
Setting up nx-x11-common (2:3.5.99.23-1build1) ...
Setting up libx2go-log-perl (4.1.0.3-5) ...
Setting up libx2go-utils-perl (4.1.0.3-5) ...
Setting up libnx-x11-6:amd64 (2:3.5.99.23-1build1) ...
Setting up libxcompshad3:amd64 (2:3.5.99.23-1build1) ...
Setting up libx2go-server-db-perl (4.1.0.3-5) ...
Setting up nxagent (2:3.5.99.23-1build1) ...
Setting up libx2go-server-perl (4.1.0.3-5) ...
Setting up x2goserver-x2goagent (4.1.0.3-5) ...
Setting up x2goserver (4.1.0.3-5) ...
Setting up x2goserver-xsession (4.1.0.3-5) ...
Processing triggers for systemd (245.4-4ubuntu3.21) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.9) ...
root@noc /var/log/apt #
############################
This story has an happy ending: I have obtained back the control of my
server (well, actually a KDE destkop install), and this is wonderful.
So, as promised, I'm gonna donate via
https://www.betterplace.org/en/donate/ww-sparkasse-ulm/projects/111056,
inviting everyone else reading to follow me, because you guys deserve that.
All the best, and - one more time - thanks!
PS Anyway Discover lists me tons of packets available for updates. There
is not/any x2go packet listed anymore, as it happened two days ago.
Would it be safe proceeding with that (huge) updates session?
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