Pyrealsense's documentation says that it has been tested with Ubuntu 16.04 LTS. I could find no mention of past compatibility with 14.04 LTS. I wonder if that is the cause of your problems.
I can run examples only from folder /Downloads/librealsense-master/build/examples not in installed folder
cpp-tutorial-1-depth: error while loading shared libraries: librealsense.so.1: cannot open shared object file: No such file or directory