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This error is because the rviz command wants to create a GUI window on a desktop, but it is not finding a desktop. Are you trying to run this command on a real robot? When used with a real robot, usually rviz is run on a separate laptop/desktop computer. To do that requires that you set up a ros network between the laptop and the robot.

This error is because the rviz command wants to create a GUI window on a desktop, but it is not finding a desktop. Are you trying to run this command on a real robot? When used with a real robot, usually rviz is run on a separate laptop/desktop computer. To do that requires that you set up a ros network between the laptop and the robot.

If you put the keywords turtlebot rviz into the search bar at the top of this page, you will get a lot of hits.