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gedit /opt/ros/hydro/setup.bash will open with empty document, no matter if the file exists and is empty or does not exist. Go to the path in your file system (cd /opt cd ros cd hydro) and check (ls) whether the file exists... Most likely the entire folder /opt/ros/hydro will not exist. If that's the case something went wrong during the installation. Try repeating the steps mentioned in http://wiki.ros.org/hydro/Installation/Ubuntu and watch carefully for possible errors..

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