Just after latest update of my Ubuntu 20.04 from Dec 21, 2020 I am getting HPLIP message:
HPLIP Status service
No system tray detected on this system.
Unable to start, exiting.
And also zoom meeting application system tray icon disappeared while Zoom runs fine itself. Zoom started from autostart menu:
Zoom icon appears at systray if started manually.
The version 33.1-0ubuntu0.20.04.2 of gnome-shell-extension-appindicator released for Ubuntu 20.04 does not have this problem!
It seems to happens when gnome-shell-extension-appindicator is updated from 33-1 to 33.1-0ubuntu0.20.04.1.
Please file a bug report from the Ubuntu terminal:
ubuntu-bug gnome-shell-extension-appindicator
or add yourself as "This bug affects you" to an existing bug report.
Open a terminal by pressing Ctrl+Alt+T and enter the following commands:
sudo apt install gnome-shell-extension-appindicator=33-1
sudo apt-mark hold gnome-shell-extension-appindicator
The first command installs the older, working version of the app gnome-shell-extension-appindicator. The second command makes sure the app is not updated to the newer version during the next update.
When the bug is fixed and a newer version of gnome-shell-extension-appindicator is released, or if you want to undo the changes by this workaround, open the terminal again, and use the following command:
sudo apt-mark unhold gnome-shell-extension-appindicator
If for some reason you don't want to use the older version of the app, then read on.
While the bug gets fixed you may want to disable the hplip-systray using the Startup Application app.
As you see above, I have unchecked the box next to HP System Tray Service.
Once the bug is fixed open this app and check this box. This will return the HP icon in the system tray.
If you don't want to use the Startup Applications app, you can achieve the same goal with the following commands:
sudo cp /etc/xdg/autostart/hplip-systray.desktop ~/.config/autostart/
sudo chown $USER:$USER ~/.config/autostart/hplip-systray.desktop
nano ~/.config/autostart/hplip-systray.desktop
The last command will open the file hplip-systray.desktop in the text editor nano. Look for the line X-GNOME-Autostart-enabled=true and change true to false. Save the changes in the file by pressing Ctrl+O and Enter. Then exit nano by Ctrl+X.
Once the bug is fixed you can revert the changes by deleting the copied file using the following command:
rm ~/.config/autostart/hplip-systray.desktop
This will delete the copied and changed file.
I was able to reproduce your problem. If I set Zoom to start at startup, then the Zoom icon does not show in the system tray. However, Zoom starts.
Please add this information as a comment in the bug report so that the developers know about this.
Hope this helps
