This is a Software-In-The-Loop/Hardware-In-The-Loop simulation environment for the PX4 autopilot project with Ignition Gazebo
Follow instructions on the official site to install Gazebo.
sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu-stable `lsb_release -cs` main" > /etc/apt/sources.list.d/gazebo-stable.list'
wget http://packages.osrfoundation.org/gazebo.key -O - | sudo apt-key add -
apt update
apt install ignition-edifice
The simulation can be run using the following command at the root of the PX4/PX4-Autopilot repository
make px4_sitl ignition
For more instructions when running the simulation with PX4, follow the documentation