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I would guess it's the same issue discussed here:

http://answers.ros.org/question/112391/nothing-published-to-scan-under-hydro/

Nothing is published to /scan (which is required for calibration) unless depth_registration is set to false. You might try:

roslaunch turtlebot_calibration calibrate.launch depth_registration:=false

I can't test it directly because I'm using Kobuki-based turtlebots.

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