Install kacpimon by entering the following commands in the terminal:
sudo apt update sudo apt install kacpimon
Description:
Kernel ACPI Event Monitor
Modern computers support the Advanced Configuration and Power Interface (ACPI) to allow intelligent power management on your system and to query battery and configuration status. . kacpimon is a small tool that monitors kernel ACPI and keyboard events from multiple interfaces and reports them to the console.
Homepage: http://sourceforge.net/projects/acpid2/
Version: 1:2.0.28-1ubuntu1
Section: universe/utils