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Since the rabbit hole of investigating existing known working ros packages was leading me definitely in the wrong direction and also because Mike seemed so adamant that ros could not be at fault, thanks Mike, I decided to compare in detail the entire home folder from both robots. This showed my mistake when looking at the .bashrc files.

Melodic .bashrc:

ROS_MASTER_URI=http://rosbot.local:11311
ROS_HOSTNAME=rosbot.local

Kinetic .bashrc:

export ROS_MASTER_URI=http://rosbot.local:11311
export ROS_HOSTNAME=rosbot.local

As can be seen the 'export' command was missing!!!
Case closed

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