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I'm not sure if this will help as I'm running mine on hydro and 12.04 but this helped me out. http://answers.ros.org/question/61211/problem-with-xtion-pro-live-and-openni_camera/?answer=61212#post-id-61212 When I first was troubleshooting, I saw this above question and went into GlobalDefaults.ini and changed UsbInterface to 2 but something that was not mentioned in the answer was you need to reboot the computer after you change this file. I did not when I first tried it out, it didn't work, so I assumed it was bad advice but I saw elsewhere that you do need to reboot and that fixed my problem.
Steps:
sudo chmod 666 /etc/openni/GlobalDefaults.ini
Uncomment the UsbInterface line and set value to 2
REBOOT computer
roslaunch openni_launch openni.launch
You should be good to go after that. At least that is what worked for me. Now getting my Kinect to work is another issue that has been bothering me for quite some time now but that's a different question for another day after I hack around some more.