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This sounds a lot like you ROS_PACKAGE_PATH is not set correctly. Are you sure your 'rosserial_arduino' package is inside a directory that is known to ROS via ROS_PACKAGE_PATH as described here?

This sounds a lot like you your ROS_PACKAGE_PATH environment variable is not set correctly. Are you sure your 'rosserial_arduino' package is inside a directory that is known to ROS via ROS_PACKAGE_PATH as described here?