I have installed Ubuntu 18.10 five times and it has worked perfectly without fiddling. HDMI audio is perfect as is wireless, There is a default setting for analog output audio in Ubuntu, I think it is under
sound/output in settings. Once it is changed to digital HDMI the audio works.
Haven't played with Bluetooth but indications are normal. I pulled the Internet connection to keep out updates and drivers whose effects I do not know from online installation. Have not tried Ubuntu 18.10 updates, stayed with the ISO.
Obviously Ubuntu has the HDMI drivers needed for the Pi. I am a noobie and like Mint 19 MATE.
Would it be possible to pull an audio driver/module from Ubuntu 18.10 and install it in Mint 19 MATE since they are closely related?
What would that involve? I need expert advice since I am out of my comfort zone.