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This question already has an answer here:

no sound on ubuntu 16.04 .In setting it say dummy sound after downloading on to a mini pc it says dummy sound what does that mean .what can i try ?

marked as duplicate by Eliah Kagan, Fabby, Mike, karthick87, clearkimura Oct 1 at 15:07

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Try pulseaudio -k && sudo alsa force-reload

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I just had this problem a couple hours ago. Usually just switching to a different device fixes it but not this time. So I used:

rm ~/.pulse/           # In my case this directory was empty
rm ~/.config/pulse/*
pulseaudio -k

There was a link I followed: https://askubuntu.com/a/15226/307523

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