Comment 14 for bug 1810861

This looks odd: PulseAudio is not running, so of course you won't get any sound:

!!Sound Servers on this system
!!----------------------------

Pulseaudio:
      Installed - Yes (/usr/bin/pulseaudio)
      Running - No

To try and fix that please add a line to /etc/pulse/daemon.conf:

  realtime-scheduling = no

and then reboot.

If that doesn't fix the problem then please also follow these instructions to search for possible pulseaudio crashes: https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment