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We found the real problem thank to you. It was about the school's proxy who blocked port 123 allowing the update of time. The new problem is about Rviz and more precisely 'odom'. We have always 2 turtlebots connected on the workstation and we want to see both on Rviz but we don't know how to see them correctly. For the moment, Rviz get information of two turtlebots and think they are the same robot. Does we have to make launch and how exactly just for a example of 2 turtlebots? tf_frames could be one of the problem too?