On Ubuntu 20.04 I experience similar issue as diagnosed by @prayerholmes . Selecting on the pop-up headset breaks the audio (but the microphone works!). After changing on settings->audio the input from `headset microphone - built-in audio` to `Internal microphone - built-in audio` and then back to `headset microphone - built-in audio` it works ok.
On Ubuntu 20.04 I experience similar issue as diagnosed by @prayerholmes . Selecting on the pop-up headset breaks the audio (but the microphone works!). After changing on settings->audio the input from `headset microphone - built-in audio` to `Internal microphone - built-in audio` and then back to `headset microphone - built-in audio` it works ok.
My computer is a Dell XPS 9550.