In my system I can hear sound only from here while modifying it in settings
and occasionally system popup/error sounds.
And sound is not coming from any other videos, songs, Youtube, test speakers etc.,
I followed this and some other, but no use. Why I can able to hear from that and no where else except while modifying output volume?
I had this exact problem after upgrading from Ubuntu 16.04 to 18.04. No program could output audio, except the system settings speaker test.
I was able to fix it by deleting the config files in
~/.config/pulse
and then restarting pulseaudio withpulseaudio --kill
. It should restart immediately and recreate the config files with what seems to be default settings.After that audio worked again :)