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How to Fix the No Sound Issue in Ubuntu
https://www.maketecheasier.com/fix-no-sound-issue-ubuntu/#:~:text=How%20to%20Fix%20the%20No%20Sound%20Issue%20in,reinstalling%20ALSA%20and%20PulseAudio%20in%20the%20following%20manner.
Troubleshooting Linux Sound
http://troubleshooters.com/linux/sound/sound_troubleshooting.htm
Sound Troubleshooting Script: Go fast or go home. Troubleshooting Linux sound can consume horrendous amounts of time. Life's too short and precious for such time wasters: We need a better way, and this is it: Diagnostic tests based on likelihood and ease, combined with ./unmute_all.sh a shellscript that unmutes all ALSA mutes.
Troubleshooting Linux Audio, Part 1 - Linux Journal
https://www.linuxjournal.com/content/troubleshooting-linux-audio-part-1
In sympathy with his plight I present here a primer in three parts for troubleshooting common and uncommon problems with the Linux sound system. Parts 1 & 2 will present programs used to analyze and configure your audio setup. Part 3 will list the most frequently encountered problems along with their suggested solutions.
Troubleshooting [Linux-Sound]
https://wiki.linuxaudio.org/wiki/troubleshooting
When you get 'Device or resource busy' errors when connecting to your sound card, it is likely that some application has taken full control over the 'lower level' interface to the sound card. To determine which application is holding the sound card, you can use 'fuser' on the audio device nodes /dev/dsp and /dev/snd/*:
Troubleshooting Linux Audio, Part 3a - Linux Journal
https://www.linuxjournal.com/content/troubleshooting-linux-audio-part-3a
If you still have no sound (after double-checking all steps taken so far), then it's time to call for reinforcements. Search the archives of the Linux Audio Users and the Linux Audio Developers mail-lists. You may want to check the ALSA list archives as well (and it would be a good idea to join those lists). Search Google, starting with a string such as "sblive problem …
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