Thank you for the feedback and hints.
I was able to install the NodeRed Dashboard. Here is the history of my findings so this can help others.
Installed instance of NodeRed on AWS EC2. Node Red runs ok
Opened Node Red Palette manager and installing the Node Red Dashboard - failed.
Installing other packages also fails from the Paletter Manager.
So tried SSH and using command line which will wors
Solution:
SSH back to the EC2 with Putty.
-Goto .node-red directory
-sudo npm i node-red-dashboard
-reboot the server
That works.