Install wmnut by entering the following commands in the terminal:
sudo apt update sudo apt install wmnut
Description:
WindowMaker dock app that displays UPS statistics from NUT's upsd
WMNUT monitors UPS statistics through the NUT (Network UPS Tools, http://www.networkupstools.org) framework on Linux and other systems. This information, presented in a nice visual format, can be invaluable on stations using an UPS.
Homepage: http://wmnut.networkupstools.org/
Version: 0.66-1
Section: universe/x11