$ sudo apt-get update
$ sudo apt-get install datafreedom-qsfxsl 

datafreedom-qsfxsl is installed in your system.

Make ensure the datafreedom-qsfxsl package were installed using the commands given below,

$ sudo dpkg-query -l | grep datafreedom-qsfxsl *

You will get with datafreedom-qsfxsl package name, version, architecture and description in a table

datafreedom-qsfxsl package basic information: