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Usually, it's good practice to fix the first error first, in this case the "rosdep: command not found". Google or the ROS wiki search will give you instructions how to install rosdep (e.g. http://www.ros.org/wiki/rosdep).
The line "sudo apt-get install [...] # only if something is missing" was not intended to be typed in literally, but means that you should install those packages that rosdep reported as missing.
Moritz