$ sudo apt-get update
$ sudo apt-get install flightgear-phi 

flightgear-phi is installed in your system.

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

$ sudo dpkg-query -l | grep flightgear-phi *

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

flightgear-phi package basic information: