For some reason, 18.04 beta 2 has decided it wants to output sound via my Samson Meteor Condenser Mic instead of the analog output. I can select it in the Raven panel or Sound control panel, but it does not persist between reboots. Also the default sound is blank.
Sounds like a pulseaudio issue. Especially since you changed it via the sound panel.
This will report the issue on launchpad so that the developers are aware of the issue and can advise further.
Thanks, I did it when you said but I forgot to update this thread.