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This looks like a classic ROS Networking issue that is described here: http://wiki.ros.org/ROS/NetworkSetup. Particularly look at ROS_IP and ROS_HOSTNAME.

I can't explain the upgrade to 18.04 off hand. Though I will say that there is 0 intent, testing, or support for mixing ROS distributions. If the networking support doesn't fix it, you should again move back to Indigo or upgrade your robot to Melodic