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I have a reasonably up-to-date version of 14.04 with Indigo, and I can start the camera calibration node without issue.
This is either an issue with a very recent version of camera calibration, or an issue with your system.
The version of opencv that is normally used by ROS is Ubuntu's default version, and it does not ship with the "nonfree" module, and the accompanying python wrapper shouldn't be trying to load it.
Does trying to load the OpenCV python wrapper by itself work? Try:
python -c 'import cv2'
Have you done anything to modify your version of OpenCV, or attempted to install OpenCV3? Did you do an installation of OpenCV from source, in addition to the version of OpenCV that already comes with ROS?
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