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Some hints, not truly an answer:
Use the command rospack list | grep gazebo
and check which ones you have for gazebo.
It is also important to check your $ROS_PACKAGE_PATH
to make sure you have the libraries of ROS included in your environment.
Relevant question: https://answers.ros.org/question/353161/problem-resource-not-found/
P.S. Question is terribly formatted and hard to understand so it is shot in the dark.