Your system is logging a couple of issues repeatedly:

Nov 25 15:00:52 username-desktop pulseaudio[2489]: [pulseaudio] alsa-
mixer.c: Volume element Speaker has 8 channels. That's too much! I can't
handle that!


Nov 25 15:12:09 username-desktop pulseaudio[3489]: [pulseaudio] shm.c:
shm_open() failed: No such file or directory

Bug 1652505 mentions that second one too. In that case the solution was
to get a newer version of PulseAudio. Can you try Ubuntu 17.10 or 18.04
by any chance?

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  In Xfce, Gnome3, Ubuntu Studio, and Mate Desktop the pulse audio gui
  application is corrupted, I can't switch outputs.

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