$ journalctl -f
May 05 14:32:30 work-pc1 gnome-control-c[2052]: Failed to enable service 
vino-server: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Sharing cannot 
be enabled on this network, status is '0'

$ nmcli d status
DEVICE  TYPE      STATE      CONNECTION 
enp2s0  ethernet  unmanaged  --         
lo      loopback  unmanaged  --         

$ /usr/lib/vino/vino-server

05/05/2020 15:10:09 Autoprobing TCP port in (all) network interface
05/05/2020 15:10:09 Listening IPv6://[::]:5900
05/05/2020 15:10:09 Listening IPv4://0.0.0.0:5900
05/05/2020 15:10:09 Autoprobing selected port 5900
05/05/2020 15:10:09 Advertising security type: 'TLS' (18)
05/05/2020 15:10:09 Re-binding socket to listen for VNC connections on TCP port 
5900 in (all) interface
05/05/2020 15:10:09 Listening IPv6://[::]:5900
05/05/2020 15:10:09 Listening IPv4://0.0.0.0:5900
05/05/2020 15:10:09 Clearing securityTypes
05/05/2020 15:10:09 Advertising security type: 'TLS' (18)
05/05/2020 15:10:09 Clearing securityTypes
05/05/2020 15:10:09 Advertising security type: 'TLS' (18)
05/05/2020 15:10:09 Advertising authentication type: 'No Authentication' (1)
05/05/2020 15:10:09 Re-binding socket to listen for VNC connections on TCP port 
5900 in (all) interface
05/05/2020 15:10:09 Listening IPv6://[::]:5900
05/05/2020 15:10:09 Listening IPv4://0.0.0.0:5900

also what interface is the settings panel listing at the bottom is that your 
correct eth one? 
The "network" part of the settings panel reads: "Es sind keine Netzwerke zur 
Freigabe gewählt." (german locale) which can be translated to "No network has 
been selected for sharing".

** Changed in: gnome-control-center (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1876884

Title:
  Unable to enable screen sharing after upgrade to 20.04

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