I have two desktops running Ubuntu 18.04 and both stopped playing sound (through speakers or headphones) after the Ubuntu 18.04 update.

I have tried these suggestions but none have worked:

https://www.linuxuprising.com/2018/0...-issue-in.html
https://askubuntu.com/questions/1029...n-ubuntu-18-04
https://www.maketecheasier.com/fix-n...-issue-ubuntu/
https://itsfoss.com/fix-sound-ubuntu-1304-quick-tip/

Can anyone help?