$ sudo apt-get update
$ sudo apt-get install flightgear-data-base 

flightgear-data-base is installed in your system.

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

$ sudo dpkg-query -l | grep flightgear-data-base *

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

flightgear-data-base package basic information: