sudo apt-get install libprotobuf-dev=3.0.0-9.1ubuntu1 libprotoc-dev=3.0.0-9.1ubuntu1 protobuf-compiler=3.0.0-9.1ubuntu1

commit: 601c588294973caf105b79a23f7587c6b991bb05

Qground control: 
wget https://github.com/mavlink/qgroundcontrol/releases/download/v4.2.0/QGroundControl.AppImage
chmod +x QGroundControl.AppImage

mavros/mavlink:
cp -R ~/catkin_ws/src/oscillation_ctrl/bash_scripts/rosinstall.txt /tmp/mavros.rosinstall
wstool merge -t src /tmp/mavros.rosinstall
wstool update -t src -j4
rosdep install --from-paths src --ignore-src -y
catkin build

steps:
wget https://raw.githubusercontent.com/PX4/Devguide/master/build_scripts/ubuntu_sim_ros_melodic.sh
bash ubuntu_sim_ros_melodic.sh
git clone https://github.com/PX4/PX4-Autopilot.git --recursive
git checkout 601c588294973caf105b79a23f7587c6b991bb05