If ROS is not installed, please, install it following the instruction:
http://docs.ros.org/en/rolling/Installation/Ubuntu-Install-Debians.html
Alternatively you can use the following command, but we cannot guarantee it will always work.
cd ~/ros/src/robocar110_ros/ # repo root
make ros-install
Optionally, ros sourcing can be put to ~/.bashrc. You need to restart terminal after that.
make ros-source