$ sudo apt-get update
$ sudo apt-get install kubuntu-driver-manager 

kubuntu-driver-manager is installed in your system.

Make ensure the kubuntu-driver-manager package were installed using the commands given below,

$ sudo dpkg-query -l | grep kubuntu-driver-manager *

You will get with kubuntu-driver-manager package name, version, architecture and description in a table

kubuntu-driver-manager package basic information: