Cannot register authentication agent

[Ind]

After a fresh install of Lubuntu 20.04.1 LTS, GUI applications cannot function properly unless run using sudo
For example nm-tray cant add a wireless network unless an instance is run using sudo
When I start KDE partition manager from menu, it does not show any devices
File manager cannot mount any device
/etc/xdg/autostart/polkit-kde-authentication-agent-1.desktop is present
but when I try to start it manually following error is shown:

QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
New PolkitAgentListener 0x7f478c003da0
Adding new listener PolkitQt1::Agent::Listener(0x7f4784014960) for 0x7f478c003da0
Listener online
"Cannot create unix session: No session for pid 2638"

** (process:2638): CRITICAL **: 20:56:18.844: polkit_agent_listener_register_with_options: assertion 'POLKIT_IS_SUBJECT (subject)' failed
"Cannot register authentication agent!"
Authentication agent result: false
Couldn't register listener!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: polkit-kde-agent-1 4:5.18.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Sat Aug 1 20:42:04 2020
InstallationDate: Installed on 2020-07-30 (2 days ago)
InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: polkit-kde-agent-1
UpgradeStatus: No upgrade log present (probably fresh install)

[Ind (user0010)]

Authentication agent cannot be started

[Scarlett Gately Moore (scarlettmoore)]

This bug is very old, if it is still an issue please update the bug with info from a supported release.