$ sudo apt-get update
$ sudo apt-get install freedroidrpg-data 

freedroidrpg-data is installed in your system.

Make ensure the freedroidrpg-data package were installed using the commands given below,

$ sudo dpkg-query -l | grep freedroidrpg-data *

You will get with freedroidrpg-data package name, version, architecture and description in a table

freedroidrpg-data package basic information: