Each time I reboot Ubuntu 19.10, I have to open gnome-control-center and set the sound output device back to my Laptop's Built-in speakers. Otherwise, it will typically default to DisplayPort devices that don't even have speakers.
Which file are these settings saved to? I'm thinking that maybe that file is corrupted and that if I delete that file maybe Ubuntu 19.10 will start remembering my sound output preferences. I'm also open to other suggestions.