OT no-repro "I gave up on Ubuntu, Lubuntu and Xubuntu. I looked for a different distro of Linux that was lightweight and not derived from Ubuntu. It worked immediately with no problems at all."
OT no-repro "SOLVED: started working. I did nothing. I suspect Netflix was doing something as my friend had problems with Netflix at the exactly same time on his windows PC."
OT no-repro Replaced Ubuntu with Debian "Audio works now (debian11)"
reopen - The answer is quite clear. I also added the requested info which was posted in the comments section. The comments below the question can be removed, as they don't offer additional info now (I have flagged them).