sudo apt-get purge flightgear
sudo apt-get clean
sudo vi /etc/apt/preferences.d/flightgear
  Add the following:
  Package: flightgear
  Pin: version 3.0.0-1~getdeb1
  Pin-Priority: 1001
sudo apt-get update
sudo dpkg -i flightgear_3.0.0-1~getdeb1_amd64.deb
sudo apt-get -f install