I have also checked and it works perfectly after the update. Thank you.

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https://bugs.launchpad.net/bugs/1871787

Title:
  Screen sharing can not be enabled from the Gnome Control Center

Status in gnome-control-center package in Ubuntu:
  Fix Released

Bug description:
  Ubuntu Version: Ubuntu Focal Fossa
  Package version: 1:3.36.1-1ubuntu4
  Expected: Using Screen sharing as expected and often used before
  Result: Screen sharing is disabled and can't be reenabled

  I have checked the system logs and found this entry:
  gnome-control-c[223776]: couldn't list networks: 
GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Invalid service name 
'vino-server'

  Then I have tried to reinstall the vino package in case that something broke 
in the update yesterday. This did not help so I tried executing the binary 
manually and this worked:
  /usr/lib/vino/vino-server 
  09/04/2020 10:16:55 Autoprobing TCP port in (all) network interface
  09/04/2020 10:16:55 Listening IPv6://[::]:5900
  09/04/2020 10:16:55 Listening IPv4://0.0.0.0:5900
  09/04/2020 10:16:55 Autoprobing selected port 5900
  09/04/2020 10:16:55 Advertising security type: 'TLS' (18)
  ... (shortened)

  The problem might be something related to DBus but I'm not shure.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gnome-control-center 1:3.36.1-1ubuntu4
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu25
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Apr  9 10:09:05 2020
  InstallationDate: Installed on 2017-11-18 (872 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-control-center
  UpgradeStatus: Upgraded to focal on 2020-04-03 (5 days ago)

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