Ubuntu 16.04 Sound Won't Unmute

Solution 1:

I am not sure whether this solution work or not, after hours of debugging I have deleted the pulse audio config settings and boom!!!, it worked.

Take backup before doing it and do it at your own risk

  1. take a backup first

    cp -r ~/.config/pulse ~/.config/pulse_bak
    
  2. remove the pulse config

    rm -rf ~/.config/pulse
    

Good luck