With Ubuntu and Linux you don't usually need to install any drivers. It
does however look like pulseaudio is failing on the machine, which will
cause loss of sound:

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

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

To try and fix this, please run:

sudo sh -c "echo 'realtime-scheduling = no' >> /etc/pulse/daemon.conf"

and then reboot.

** Changed in: pulseaudio (Ubuntu)
       Status: New => Incomplete

** Tags added: realtime

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https://bugs.launchpad.net/bugs/1789244

Title:
  Sound driver does not appear to show

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