It made no difference whether I used sudo or not. This bug is called
"/dev/dsp busy, but no program using it"

Exclusive usage of /dev/dsp IS NOT a bug. It's a hardware limitation of
your sound card, which doesn't support hardware mixing. The Open Sound
System (OSS) architecture does NOT support software mixing - therefore,
you can't have two or more OSS apps at the same time if your sound card
doesn't support hardware mixing. You can recognize OSS by use of
/dev/dsp as the audio device.

The solutions are few. You can buy a better sound card; you can
configure these programs to use Advanced Linux Sound Architecture (ALSA)
which supports software mixing; or, you can use the alsa-oss (aoss)
wrapper to run OSS programs through ALSA.

This what you experience is NOT a bug. It's a limitation of OSS.

A bug is when /dev/dsp is busy when no programs are using it.

-- 
/dev/dsp busy, but no program using it
https://bugs.launchpad.net/bugs/76876
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Bugs, which is the bug contact for Ubuntu.

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