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What's the output of rospack find rosbridge_server? If it's not a directory location, then either the package is missing or not visible.

ros-melodic-desktop-full doesn't have RosBridge, you'd have to install it separately using sudo apt-get install ros-melodic-rosbridge-suite (check out RosBridge tutorial).

After installing RosBridge, re-source ROS and then try launching rosbridge_websocket.launch.

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