System tray icons not showing in panel 18.04

Support & Help Requests
7

Hello,
Thanks to @Dashy URL, you may now try a trick posted on Aug 20, 2018 at https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1754458 in comment #15 :

  1. Edit this file : /usr/share/indicator-application/upstart/xdg/autostart/indicator-application.desktop

  2. Add MATE in the following option such as :

OnlyShowIn=Unity;MATE
  1. Reboot.

Missing icons should be restored.

  • In “Startup Applications” (or “Control Center” > “Startup Applications”), ensure there’s no Ayatana application enabled to start on boot.
  • Make sure to undo other modifications you attempted for fixing this problem before now.

There’s another trick on post #21 on the same link.