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I need some more info from you... Are you on a turtlebot? Are you using a kinect camera? Is it powered from the turtlebot?
Assuming you have the turtlebot with a kinect: I had some trouble when I plugged the kinect into the USB 2.0 ports. Try it int he USB 3.0. If that doesn't fix it, run this and post the output:
lsusb