I got the sound working after trying the following fixes stated in 
<https://askubuntu.com/questions/1230363/20-04-internal-speaker-audio-is-not-working-in-ubuntu-20-04-lts-after-upgradi>:
- sudo alsa force-reload
- sudo apt install pavucontrol
- sudo apt install alsa-tools-gui and setting jack_detect = no
- timidity-daemon was already not installed

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https://bugs.launchpad.net/bugs/1873641

Title:
  pulseaudio says: ALSA woke us up to write new data to the device, but
  there was actually nothing to write.

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