How to disable network printer discovery in Ubuntu 18.04?

Question

There are several open questions regarding older Ubuntu versions but none provide a working answer. Here are the steps I tried:

1. I disabled discovery in cups-browsed configuration
2. I disabled the whole service
3. I removed the service
4. I completely disabled avahi.

The last step worked but as I'm using avahi for other network discovery services, I don't want to remove it. Steps 1-3 work in CUPS itself, somehow Gnome is adding the printers, though. So what I'm looking for is the Gnome setting to disable printer discovery.

Answer 1

Answering my own question, the only solution I found so far is disabling avahi:

sudo systemctl stop avahi-daemon.service
sudo systemctl disable avahi-daemon.service
sudo systemctl stop avahi-daemon.socket
sudo systemctl disable avahi-daemon.socket

I would love a better solution of course.