$ sudo apt-get update
$ sudo apt-get install kadu-external-modules 

kadu-external-modules is installed in your system.

Make ensure the kadu-external-modules package were installed using the commands given below,

$ sudo dpkg-query -l | grep kadu-external-modules *

You will get with kadu-external-modules package name, version, architecture and description in a table

kadu-external-modules package basic information: