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You can only have one roscore active (and configured) at a time. In case of the turtlebot the roscore should always run on the turtlebot itself to keep latencies and actual network usage low.

If you wanted to use a roscore on your workstation to work, while the turtlebot isn't running, you have to change your ROS_MASTER_URI to the name or IP of your workstation.

Dont forget to source the .bashrc again after the change, or restart your open consoles.