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I wrote about this topic in https://the-bug.de/?p=29 and I did gain some more knowledge about it.

If you try to open a topic in order to read for it (e.g. open the ‚queue‘ with the MQOO_INPUT_AS_Q_DEF option) it will fail with 2045.

Recently I accidentally uninstalled some packages on my machine which damaged the gnome-control-center and the NetworkManager/netplan on my Ubunut 20.04.
The solution was quite simply:

sudo apt-get install --reinstall gnome-control-center

But without a configured network interface it was impossible to do this offline…
But with

sudo dhclient <interface>

It was possible to get a configuration (IP address, gateway, …) and than the fix was quite straight forward.