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Probably because controller_manager is not installed.

Fix:

sudo apt install ros-kinetic-controller-manager

In general, it's best to use rosdep to install missing packages. I'm going to assume that:

  • you are using ROS kinetic
  • your catkin workspace is ~/catkin_ws
  • you've checked out gazebo_ros_demos (which includes rrbot_control) into ~/catkin_ws/src/gazebo_ros_demos

Then do this:

source /opt/ros/kinetic/setup.bash
sudo rosdep init
rosdep update
cd ~/catkin_ws/src
rosdep install -i --from-paths .

This will install all missing dependencies for you, and should work on 99% of all ROS packages.