Comment 15 for bug 76876

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molcrin (col-ogwencomputers) wrote : Re: /dev/dsp busy, but no program using it

I'm not an Ubuntu user, I use Sidux and came accross this page by accident, but as they are both Debian and the symptoms are the same this might work for a temporary fix:

sudo lsof | grep /dev/snd

This should just list artsd. Kill it and run your sound app straight after.

Once your program has exited artsd is restarted and your program won't have sound again.

I know this isn't the answer but, if it does on Ubuntu what it does for my Sidux then, maybe somebody with a bit more knowledge can do something with it.