$ sudo apt-get update
$ sudo apt-get install razorqt-power 

razorqt-power is installed in your system.

Make ensure the razorqt-power package were installed using the commands given below,

$ sudo dpkg-query -l | grep razorqt-power *

You will get with razorqt-power package name, version, architecture and description in a table

razorqt-power package basic information: