mkdir -p catkin_ws/src
cd catkin_ws
catkin init
catkin config --extend /opt/ros/melodic
catkin config --cmake-args -DCMAKE_BUILD_TYPE=Release
catkin config --merge-devel
cs src
wstool ini

Gazebo -> [Err] [REST.cc:205] Error in REST request

That's a known issue, the Ignition Fuel server is having SSL certificate problems.

A couple of ways to get rid of the error:

• Upgrade to Gazebo >= 9.1.0, which has Fuel disabled by default.
• Update the server in ~/.ignition/fuel/config.yaml from https://api.ignitionfuel.org to https://api.ignitionrobotics.org

libprotobuf-dev \
libprotoc-dev \
protobuf-compiler \
libeigen3-dev \
ros-melodic-octomap-msgs \
ros-melodic-mavros-msgs \
liblapacke-dev \
libeigen3-dev \
ros-melodic-octomap \
ros-melodic-octomap-ros```

---

DIR=$(pwd) source devel/setup.zsh cd ~/px4/Firmware

cd ~/custom_px4

source Tools/setup_gazebo.bash $(pwd) $(pwd)/build/px4_sitl_default

source Tools/setup_gazebo.bash $(pwd) $(pwd)/build/posix_sitl_default

export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$(pwd) export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$(pwd)/Tools/sitl_gazebo cd $DIR

---

```bash
rosdep install --from-paths src -i -y -r