This used to work @18.04 LTS but stopped working at some point, so I decided to head for the newer 20.04 LTS, but the problem persists.
What I tried:
- reinstall alsa-base and pulseaudio https://superuser.com/questions/1451847/sound-stopped-working-ubuntu-18-04
- rename alsa-base config https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1770429
- remove pulse config No sound in Ubuntu 18.04 LTS after upgrade from 16.04 LTS
None of these solutions work.
Interestingly if I run pavucontrol, while yt is playing a video, I can see an amplitude, but I can’t hear a thing. If I connect headphones it works as expected.