Failing to follow kinect tutorial

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I am new to ROS in general. I have a kinect and want to follow the tutorial from http://wiki.ros.org/openni_launch/Tut... to see what kind of data comes out of the device.

The error I get when trying to run

roslaunch openni_launch openni.launch

is

[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

Which led me to http://answers.ros.org/question/65363... which however did not fix the problem. I have tried quite some different packages to (re)install, however the error is always the same.

I have read through the tutorials about ROS filesystem etc, out of which the most most relevant seems to be the one about roslaunch ( http://wiki.ros.org/ROS/Tutorials/Usi... ). However, for my problem, the system does not even seem to find the .launch file.

Can anybody help me with this issue? Has something changed, or am I too dump to understand the manual?

Software versions used: Ubuntu 14.04, ROS jade (have also tried the indigo packages)