Public bug reported:

System sound no longer working. Checked my hardware by loading TAILS on a USB 
stick. Sound works perfectly. So nothing wrong with my hardware. System 
20.04.2LTS was working perfectly until latest automatic update. Noticed that in 
settings the sound screen has changed in layout. Tried various settings options 
but unable to recover sound.
settings=  output device = Line Out Built-in Audio
configuration  = Analogue Surround 5.1 Output
Used to have 7.1 but this now gone.
system pretty unusable without any sound.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-control-center 1:3.36.5-0ubuntu1
ProcVersionSignature: Ubuntu 5.8.0-44.50~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-44-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Mar  7 16:46:34 2021
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2020-11-16 (110 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1918066

Title:
  following recent automatic update on 20.04.2lts I now have no sound on
  my system

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