[Bug 1876884] [NEW] Unable to enable screen sharing after upgrade to 20.04

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After upgrading ubuntu desktop from 19.10 to 20.04, it's impossible to enable screen sharing.
It used to work fine on 19.10. 

When clicking the enable/disable toggle, the following message is logged
in journalctl:

Failed to enable service vino-server:
GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Sharing cannot be
enabled on this network, status is '0'

This is reproducible on both computers I've upgraded. They're both on
the latest 20.04 package updates as of today.

I've done some research to rule out common faults:

$ cat /etc/netplan/01-network-manager-all.yaml 
# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager

(Yes, I've ofc ran netplan apply, but the file already had this content
anyway.)

$ cat /etc/NetworkManager/NetworkManager.conf 
[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

[device]
wifi.scan-rand-mac-address=no


Also, this seems unrelated to #1871787:
$ dpkg -l |grep gnome-settings-daemon
ii  gnome-settings-daemon                      3.36.0-1ubuntu2
ii  gnome-settings-daemon-common               3.36.0-1ubuntu2
--- 
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-01-17 (108 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
Package: gnome-control-center 1:3.36.1-1ubuntu5
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Tags:  focal
Uname: Linux 5.4.0-28-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-04-28 (6 days ago)
UserGroups:
 
_MarkForUpload: True

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-collected focal
-- 
Unable to enable screen sharing after upgrade to 20.04
https://bugs.launchpad.net/bugs/1876884
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