Hi Simon, I did not ask for Avahi at all. The command line was
apt install libnss-mdns The unwanted Avahi daemon complains about missing or broken mdns support: Failed to start Avahi mDNS/DNS-SD Stack. My impression was that I cannot install mdns because it relies upon avahi, and that I cannot install avahi, because it needs a working mdns. Catch 22. Regards Harri