Most users are pros at resolving big issues with their operating systems. However, when it comes to solving petty issues, such as volume control problems, you may not know a good way of resolving that issue. This article will show you the method for troubleshooting the issue of no sound in Linux Mint 20.
https://www.linuxuprising.com/2018/06/fix-no-sound-dummy-output-issue-in.html
https://forums.linuxmint.com/viewtopic.php?t=
https://forums.debian.net/viewtopic.php?p=743378