First, download the starter code onto your laptop from this link, and save it to your Downloads folder on your laptop's turtlebot account. Then run the commands
cd ~/ros tar -xzf ~/Downloads/calib_test.tgz
You should now be able to successfully go to that directory, and build the code.
roscd calib_test make
In a second terminal window, type
rosrun turtlebot_dashboard turtlebot_dashboard &
to bring up the Dashboard. Click on the gear to bring the Turtlebot into full mode. Then, in the same window, type
rosrun joy joy_node
to start the joystick node. Finally, in the original window, run
rosrun calib_test calib_test.py
to start the starter code. When you hit button 0 (the "A" button on the joystick), the robot will begin to wander around randomly, and report distance traveled to the ROS log.