Librealsense's official installation instructions aren't exactly child's play but are at least clearer than some explanations I've seen!
My instinct though is that you should focus on the instructions that are specifically for Joule - the second link that you provided, since they include commands for installing Librealsense.
I do not need any more assistance.
After consulting with some of my colleagues I realize that the first link was for ZR300 camera, and I have R200 type.
The second link was the one that I needed for my work.
Du note that it was unclear and hard to find the correct instructions for the environment preparations for my work.
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