I run LMDE in Virtualbox. Sound worked well until I installed update pack 5, but now I have no sound. I have looked at the pulseaudio settings and there is nothing obviously wrong. The pulseaudio volume monitor shows that music is playing, but there is nothing coming out on the speakers. As the problem started with the update to Mint, I assume that something changed in Mint is the problem, but I don't know what to look for.
I had the following message in /var/log/messages before and after the update, so I assume it is not suspicious
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Sep 24 10:50:33 virtual-mint pulseaudio[2891]: [pulseaudio] alsa-util.c: Disabling timer-based scheduling because running inside a VM.
There are also some messages about measured clock being rejected, but that was the same before the update as well.
Any thoughts on how to debug this would be welcome.