The audio on everything is gone, nothing in browsers or viewers. I just downloaded 18.04, but it didn't work on 16.04 either. I can watch videos fine but only with missing sound.
These are my specifications:
This tutorial worked for me when I had 16.04. It also worked for me with 18.04, but I didn't do all of the steps.
What I did was to skip all of the steps, tried this in terminal that I saw in another posting.
pulseaudio --start
and then went straight to step 6.
sudo apt-get install pavucontrol
then run
pavucontrol
With this opened, I went to the Output Devices tab and changed the Port to Line Out (unplugged). And then I saved the icon in the launcher to add to favorites. Whenever you restart or start up your system, you might need to set this setting. I wish there was an automated setting where it is always set. I also changed my configuration to analog stereo output and then moved the slider under the port setting in the Output Devices tab from Silence to 100% (0dB).
To automate it, after setting volumes through pavucontrol, from terminal:
alsactl store
and autorun at login the restore command (probably both by sudo, whitelisting the command on sudoers to not ask password)
alsactl restore
Let me know if this helps.
I had this problem when I connected my Computer to TV through HDMI, and then I turned-off the TV or disconnected the HDMI cable.
To fix it, I connected again the HDMI cable and went to settings, I chose PC's speakers to develop sound instead of TV's speakers.
I had this same situation.
I looked for software solutions to this for days.
Tried a new HDMI cable... that fixed the problem.
Just sayin': that might work for you, too.
