Solving my confusion for today is described here.

Gotta keep moving… I lost a couple of days with trying to and installing 2 software programs (primarily designed for Windows) for the CCNA class on my MacBook Air and it’s guest Ubuntu. The installations just did not quite work right no matter what fixes I found for the problem on Google. So, I finally talked my partner into letting me install them on his Windows computer. That was a lickity-split piece-of-cake that should have been done from the start! Oh well! I am sure I learned some things in my beating my head against the wall.