No sound on Ubuntu 18.04 (Spotify and YouTube don't work either)

Question

Since I updated Ubuntu from 16.x to 17.10 and then to 18.04 I don't have any sound. There is also a problem with videos in web browser (they look like a slideshow, still no sound) and Spotify, where it looks like music is loading but nothing happens.

Alsa info script output

Answer 1

Probably this will solve your problem.

killall pulseaudio 
rm -r ~/.config/pulse/*

Answer 2

Have you tried re-installing pulseaudio and alsa? If not, type these commands in order.

sudo apt update
sudo apt remove --purge alsa-base pulseaudio 
sudo apt install alsa-base pulseaudio 
sudo alsa force-reload

EDIT : For users with older versions of Ubuntu where apt is not there, use apt-get.

Answer 3

I came here from question

Spotify mutes itself on Ubuntu 18.04

which btw I don't think is duplicate of this but it is now closed as duplicate. So I write my answer here - the problem was actually caused by Teamspeak client that muted Spotify. When I turned of TS, Spotify didn't mute itself.

I found the way how to solve this issue here

https://forum.teamspeak.com/threads/138336-TeamSpeak-mutes-Spotify

You should check if

/etc/pulse/default.pa

contains following line

load-module module-role-cork

In case it does delete that line and restart Pulseaudio.