Comment 12 for bug 282316

Also, it seems the workaround could be a simple one.

https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/277532/comments/2

no need to kill PA, just change in audio preferences the sound capture item to Pulse Audio Server, and it would work OK.

Maybe because this is an upgrade from several previous version the setting was left as before??