Hello Dusty thanks for getting back sorry if this is a simple mistake on my part but I followed your line and got the following error below. Your futher help is very welcome :-)
patrick2020@patrick-jetson:~$ sudo apt-get install python3-dev
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies.
python3-dev : Depends: python3 (= 3.6.5-3) but 3.6.7-1~18.04 is to be installed
E: Unable to correct problems, you have held broken packages.