Disable GNOME printer discovery (avahi and cups-browsed)

disable_printer_autoadd.sh

#!/bin/bash

# NOTE: This may also disable file server auto discovery
# https://www.linuxupdate.co.uk/2021/05/19/how-to-stop-gnome-auto-printer-discovery-on-fedora-ubuntu-mint/
# Tested on Pop!_OS 20.04 LTS (Ubuntu based)

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 
   exit 1
fi

sed -i 's/use-ipv4=yes/use-ipv4=no/g' /etc/avahi/avahi-daemon.conf
sed -i 's/use-ipv6=yes/use-ipv6=no/g' /etc/avahi/avahi-daemon.conf
systemctl restart avahi-daemon

sed -i 's/# BrowseProtocols none/BrowseProtocols none/g' /etc/cups/cups-browsed.conf
systemctl disable cups-browsed
systemctl stop cups-browsed