Install gnome-shell-extension-appindicator by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-shell-extension-appindicator
Description:
App indicators for GNOME Shell
Support app indicators in top panel, as the default Ubuntu experience. . System update of KStatusNotifierItem/AppIndicator extension.
Homepage: https://github.com/ubuntu/gnome-shell-extension-appindicator/tree/ubuntu
Version: 18.04.1
Section: gnome