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The tutorial you are using is missing some files. To solve the error that you are facing you need to download these missing files from ( https://github.com/laboshinl/loam_velodyne ).

Follow these steps:

  1. you need to download the zip file of the above github link which contains all the folders.
  2. extract the folder named "tests" from this zip file.
  3. copy & paste the folder "tests" to your workspace. ( in your case /home/ubuntu/catkin_ws/src/loam_velodyne/ )
  4. Then Follow the tutorial you are using.

Hopefully this helps.