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After trying the suggested line roslaunch ur_modern_driver ur5_bringup.launch robot_ip:=IP.OF.YOUR.UR I get the same sort of error as before with the Error connecting to get firmware

Just to make sure: you are replacing IP.OF.YOUR.UR with the actual IP address of your robot's controller, right?

The ur_modern_driver prints out the error message "Error connecting to get firmware version" if it can't connect to the controller (here). It doesn't actually check the version yet at that point (error message is slightly confusing).