THANK YOU!!! I've been struggling with this for far too long in another topic I started, and though I don't understand this solution it totally works. Unless you or someone corrects my dim understanding or offers a warning about the three password inputs required, I'm going to write it up in super basic language as a new post in Tips, Tricks and Tutorials with links back to this post and my post seeking solutions. This seems to be a chronic problem with a spectrum of suggested solutions that didn't seem to work for me in Ubuntu Mate 20.04.1 so hopefully it may help other newbies.
Again, Thank You.