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Not sure what you are doing wrong, your launch file looks correct on first glance. Just as an idea for debugging, you can check if the parameter robot_description is set by running

rosparam get robot_description

from the command line. Can you do that from both localhost and auriga? Also, make sure that your network setup is correct (most importantly, ROS_MASTER_URI on auriga is set to the public IP of the machine that is running the roscore).

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