No sound on Ubuntu 20.04

Question

I recently upgraded to Ubuntu 20.04. After reboot audio is not working. I tried to reinstall pulseaudio and alsa but still not working:

sudo apt-get install --reinstall alsa-base pulseaudio 
sudo alsa force-reload

Still not working.

Answer 1

In alsamixer, disable "loopback".

Answer 2

I had the same issue.It helps to have something playing in the background while performing these steps. What worked was:

1. Opening a terminal and logging in as root

   sudo su
   

   (Or however you like to log into root.)

2. Edit the file found at /usr/share/pulseaudio/alsa-mixer/paths/analog-output-lineout.conf and change any instances of Element (such as [Element Desktop Speaker]) from switch = off to switch = on.

   gedit /usr/share/pulseaudio/alsa-mixer/paths/analog-output-lineout.conf
   

3. Reboot.