You can configure the choice of CUPS backends to be used with
sudo dpkg-reconfigure cupsys
Note that package updating keeps the current configuration, so you need to activate the backends manually, even if you update the cupsys package.
You can configure the choice of CUPS backends to be used with
sudo dpkg-reconfigure cupsys
Note that package updating keeps the current configuration, so you need to activate the backends manually, even if you update the cupsys package.