



$ sudo aptitude -purge reinstall linux-sound-base alsa-base alsa-utils linux-image-`uname -r` linux-ubuntu-modules-`uname -r` libasound2. It works fine in Windows 10 and Linux Mint 17-18. I realised that this wasn't a dummy output but it was the headphone jack from my motherboard. Ubuntu sound not working dummy output All audio input should be tested.
