Install gir1.2-ayatanaappindicator-0.1 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-ayatanaappindicator-0.1
Description:
Typelib files for libayatana-appindicator1 (GTK-2+ version)
A library and indicator to take menus from applications and place them in the panel. . This package can be used by other packages using the GIRepository format to generate dynamic bindings (GTK-2+ version).
Homepage: https://github.com/AyatanaIndicators/libayatana-appindicator
Version: 0.5.3-3
Section: universe/introspection