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How to Fix the No Sound Issue in Ubuntu - Make Tech Easier
https://www.maketecheasier.com/fix-no-sound-issue-ubuntu/#:~:text=How%20to%20Fix%20the%20No%20Sound%20Issue%20in,ALSA.%20...%205%20Reinstall%20ALSA%20and%20PulseAudio.%20
Sound problems - Ubuntu
https://help.ubuntu.com/stable/ubuntu-help/sound-broken.html
There are a number of ways for sound playback to break on your computer. Which of the topics below best describes the problem you are experiencing? Check that the sound is not muted, that cables are plugged in properly, and that the sound card is detected. Check your audio cables and sound card drivers.
Sound problems - help.ubuntu.com
https://help.ubuntu.com/22.04/ubuntu-help/sound-broken.html.en
Check that the sound is not muted, that cables are plugged in properly, and that the sound card is detected. I hear crackling or buzzing when sounds are playing Check your audio cables and sound card drivers. More Information Hardware problems Basic sound — Adjust the volume for different apps, and configure different speakers and microphones.
How To Fix No Sound in Ubuntu And Linux Mint - It's FOSS
https://itsfoss.com/fix-sound-ubuntu-1304-quick-tip/
First Alternate method to fix no sound in Ubuntu. If the above problem did not fix it for you, try reinstalling Alsa and Pulse audio in the following manner: sudo apt-get install --reinstall alsa-base pulseaudio. And force reload Alsa again: sudo alsa force-reload. Restart and check if sound is back or not. Second alternate method to fix no sound in Ubuntu
Only "Dummy output" (sound) in Ubuntu 20.04 after …
https://askubuntu.com/questions/1258510/only-dummy-output-sound-in-ubuntu-20-04-after-reboot-broken-driver-modul
No sound on upgrade (18.04 -> 20.04) only have "dummy output". Dummy output after standby since upgrading to Ubuntu 20.04. Internal speaker (Audio) is not working in Ubuntu 20.04 LTS after upgrading from Ubuntu 18.04 LTS. Ubuntu 20.04 - No sound. Soundcard not detected by pulseaudio (but by alsa)
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