kinect installation with ROS Kinetic Ubuntu 16.04

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I installed openNi, NITE and PrimeSense for Kinect Sensor.

When I enter roslaunch openni_launch openni_launch

it is not funding the package.

[openni_launch] is neither a launch file in package [openni_launch] nor is [openni_launch] a launch file name
The traceback for the exception was written to the log file

I am a beginner. Guide me in this regard.

Thanks

PS: I also followed #q207642. but didn't succeed