It looks like you are having 2 issues. The Sound selection UI not appearing and no sound coming out after plug-in. Can you have a look at this question https://answers.launchpad.net/ubuntu/+question/690501. Is this the problem you are having with sound. Should I link my question to your bug report?
It seems like its an issue with Dell's hardware and whatever changes were made between 19.10 -> 20.04
@Pierre Equoy:
It looks like you are having 2 issues. The Sound selection UI not appearing and no sound coming out after plug-in. Can you have a look at this question https:/ /answers. launchpad. net/ubuntu/ +question/ 690501. Is this the problem you are having with sound. Should I link my question to your bug report?
It seems like its an issue with Dell's hardware and whatever changes were made between 19.10 -> 20.04