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Please make sure three things.

Both computers are in the same ROS_MASTER_URI

launching keyboard teleop node without configuration would not know how to access turtlebot..

ROS_HOSTNAME of both copmuters are set with their own ip address

ROS_HOSTNAME is an optional environment variable that sets the declared network address of a ROS Node or tool.

Check velocity topic is connected properly.

Check rostopic list and rostopic info to make sure keyboard teleop is publishing and turtlebot is subscribing to the same topic.

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