Try resetting pulseaudio's user settings and restarting pulseaudio:

rm -r ~/.config/pulse*
pulseaudio -k

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Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1894075

Title:
  sound is absent ubuntu 20.04

Status in pulseaudio package in Ubuntu:
  New

Bug description:
  Could You help me with sound restore in Ubuntu 20.04 LTS after upgrade
  from Ubuntu 19.10?

  Sincerely N.E.

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: libsystemd0:amd64 245.4-4ubuntu3.2
  ProcVersionSignature: Ubuntu 5.4.0-45.49-generic 5.4.55
  Uname: Linux 5.4.0-45-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.8
  AptdaemonVersion: 1.1.1+bzr982-0ubuntu32.1
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashReports:
   640:1000:123:2243292:2020-09-02 17:38:34.836466312 +0300:2020-09-02 
17:38:35.836466312 +0300:/var/crash/_usr_lib_firefox_crashreporter.1000.crash
   640:0:123:81354:2020-09-02 14:42:34.015875816 +0300:2020-09-02 
14:42:35.015875816 +0300:/var/crash/systemd.0.crash
   640:0:123:81374:2020-09-02 14:42:33.987879276 +0300:2020-09-02 
14:42:34.987879276 +0300:/var/crash/libsystemd0:amd64.0.crash
   640:0:123:81374:2020-09-02 14:42:35.003877338 +0300:2020-09-02 
14:42:34.991878838 +0300:/var/crash/systemd-timesyncd.0.crash
  Date: Wed Sep  2 14:42:34 2020
  DpkgTerminalLog:
   dpkg: error processing package libsystemd0:amd64 (--configure):
    package libsystemd0:amd64 is already installed and configured
  ErrorMessage: package libsystemd0:amd64 is already installed and configured
  InstallationDate: Installed on 2019-09-27 (341 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190819)
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 
3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 
2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2ubuntu0.1
  SourcePackage: dpkg
  Title: package libsystemd0:amd64 245.4-4ubuntu3.2 failed to install/upgrade: 
package libsystemd0:amd64 is already installed and configured
  UpgradeStatus: Upgraded to focal on 2020-06-19 (75 days ago)
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nicolae    1554 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2019-09-01 (368 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190709)
  Package: pulseaudio 1:13.99.1-1ubuntu3.5
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Tags:  focal wayland-session
  Uname: Linux 5.4.0-42-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/21/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6SCN35WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: NO DPK
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo V330-15IKB
  dmi.modalias: 
dmi:bvnLENOVO:bvr6SCN35WW:bd06/21/2018:svnLENOVO:pn81AX:pvrLenovoV330-15IKB:rvnLENOVO:rnLNVNB161216:rvrNODPK:cvnLENOVO:ct10:cvrLenovoV330-15IKB:
  dmi.product.family: V330-15IKB
  dmi.product.name: 81AX
  dmi.product.sku: LENOVO_MT_81AX_BU_idea_FM_V330-15IKB
  dmi.product.version: Lenovo V330-15IKB
  dmi.sys.vendor: LENOVO

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