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Hi all, my name is Gianantonio, just a beginner with ROS. I had the same problem and went around for a while. I must admit that this tutorial is quite perfectly working, thanks to the writers ;-)) but... perfection is not of humans so we have to study, try and fix. We only learn from errors ;-)) When you are at Creating ROS package > para 4. Building a catkin Workspace, before typing catkin_make, go to "../catkin_ws/src/beginners_tutorials" and you should find a file named package.xml . Open it and correct sdt_msg into std_msgs. Save and continue. For my setup, this fixed the problem ;-))

Thanks again to all the creators of this tutorial. It's encouraging for a beginner like myself.