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

flightgear-data-all is installed in your system.

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

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

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

flightgear-data-all package basic information: