As a temporary fix, instead of service systemd-resolved restart as per the article, you can try this, service systemd-resolved stop
Once the service is stopped the port should be free. You'll have to do this on every reboot (though maybe you can try adding the command to /etc/rc.local to stop it on every reboot)
Came on just to say this. I'd argue that it's by party rather than by individual, so with the Dems trying to get another term Biden has to be careful not to throw a spanner into the works for Harris.