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If the folder /opt/ros/hydro/share does not exists you haven't installed the Debian package ros-hydro-roslaunch. Try installing it with sudo apt-get install ros-hydro-roslaunch.

How did you install ROS Hydro in the first place? It seems like you didn't follow the tutorials. May be you want to do that to make sure to have all base ROS packages and not lacking other packages too.

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