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My suggestion would be simply reboot your workstation and turtlebot laptop and then check
echo $ROS_MASTER_URI
echo $ROS_HOSTNAME
to see if they are correct or not. In my case I need to set the IP (echo export...) 3 times and reboot 3 times before it works. Sometimes the computer suddenly reset them to localhost without reason...
Another issue may be Electric in laptop but Groovy in Workstation. In my case I installed Electric in both.
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