@mykle1 Thanks for the reply mkyle1. See below what I get when trying to install NPM:
sudo apt-get install nodejs npm
Reading package lists… Done
Building dependency tree
Reading state information… Done
Note, selecting ‘nodejs:amd64’ instead of ‘npm:amd64’
nodejs is already the newest version (8.11.1~dfsg-2~bpo9+1).
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:
nodejs : Conflicts: nodejs:amd64 but 10.15.1-1nodesource1 is to be installed
nodejs:amd64 : Depends: python-minimal:amd64 but it is not going to be installed
Conflicts: nodejs but 8.11.1~dfsg-2~bpo9+1 is to be installed
E: Unable to correct problems, you have held broken packages.