I have an Ubuntu 14.04 system, on which I want to install OpenCV and use it with Python 2.x.
I installed OpenCV using the instructions here: https://help.ubuntu.com/
If you really sure that you installed cv2 but it gives no module error. There is a solution for this. Probably you have cv2.so file in your directory
cv2.so
/usr/local/lib/python2.7/site-packages/cv2.so
move this cv2.so file to
/usr/lib/python2.7/site-packages
copy the file into site-packages directory