Install flightgear-data-all by entering the following commands in the terminal:
sudo apt update sudo apt install flightgear-data-all
Description:
FlightGear Flight Simulator - virtual package
FlightGear is a free and highly sophisticated flight simulator. . This is a dependency package linking all data packages for FlightGear.
Homepage: http://www.flightgear.org/
Version: 1:2018.1.1+dfsg-1
Section: universe/games