HPLIP hp-systray tray icon does not show dropdown menu in MATE Panel on 18.04 LTS and newer versions

[Norbert]

Steps to reproduce:
1. Install Ubuntu MATE 18.04 LTS with all updates
2. Install HPLIP into it with `sudo apt install hplip-gui`
3. Log out.

Expected results:
* HPLIP shows hp-systray icon and its fully functional

Actual results:
* HPLIP shows hp-systrat icon but it is non-functional (see screenshot)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mate-panel 1.20.1-3ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Jan 7 12:15:48 2019
InstallationDate: Installed on 2019-01-07 (0 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: mate-panel
UpgradeStatus: No upgrade log present (probably fresh install)

[APolihron (apolitech)]

Hmm feels more a hp-lip problem then a Ubuntu Mate one

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[nmaxx (nmaxx)]

Same problem here - the hplip version is 3.17.10+repack0-5,m btw. (not exactly recent, it could really use an SRU to the latest upstream release).

[Norbert (nrbrtx)]

Ubuntu MATE 18.10 (cosmic) is affected too.

[Norbert (nrbrtx)]

Ubuntu MATE 19.04 (disco) is affected too.

[Norbert (nrbrtx)]

As I have already wrote on AskUbuntu ( https://askubuntu.com/a/1107774/66509 ):

"
To fix the menu display we need to launch hplip with help of DBus (as in [DropBox case](https://askubuntu.com/a/1065718/66509)) by creating and editing this file:

    killall hp-systray
    rm ~/.hplip/hp-systray.lock
    mkdir -p ~/.config/autostart/
    cp /etc/xdg/autostart/hplip-systray.desktop ~/.config/autostart/
    sed -i "s/hp-systray -x/dbus-launch hp-systray -x/" ~/.config/autostart/hplip-systray.desktop

and then reboot and enjoy
"

[Norbert (nrbrtx)]

Still a problem for Ubuntu MATE 19.04 beta2.

[Norbert (nrbrtx)]

Only HPLIP have problems with showing icon.
Other apps as RedShift and Solaar do not have such a problem on upcoming Ubuntu MATE 19.10.

[Coeur Noir (coeur-noir)]

Does not seem specific to Mate, here is Ubuntu Budgie 18.04 → https://discourse.ubuntubudgie.org/t/hplip-hplip-toolbox-broken-in-budgie/2749/26?u=coeur-noir

[Norbert (nrbrtx)]

Still not fixed in Ubuntu MATE 20.04 LTS installed from 20200321.

[Norbert (nrbrtx)]

Bug still exists in latest Ubuntu MATE 22.04 LTS.