@mikael Thx! I have used the same links for documentation lookup. Perhaps, something to do with Ubuntu 19.04 (my desktop client) -- don't even want to guess since I don't have a handle on the issue which is similar to the one I experienced with Raspian (when trying out the Grove AI HAT). Right now, I am clearing the decks to work on MicroPython using the pointers from @loboris Kind regards.