Install ayatana-indicator-power by entering the following commands in the terminal:
sudo apt update sudo apt install ayatana-indicator-power
Description:
Ayatana Indicator showing power state
This Ayatana Indicator displays current power management information and gives the user a way to access power management preferences. . The Ayatana Indicator provides a generic, multi-desktop-env aware approach of accessing power information and management features.
Homepage: https://github.com/AyatanaIndicators/ayatana-indicator-power
Version: 2.0.92-1
Section: universe/gnome