SOLVED!
It is all about the Brave New World of UEFI.
After many unsuccessful tries with 16.10, I started trying 17.04 and succeeded but what I learned probably works for 16.10 as well, too.
First I did a clean install of version 17.04 and it loaded ok, same as 16.1 but it wouldn't boot either so I then went to: http://www.rodsbooks.com/refind/index.html
I downloaded the program - rEFInd onto a rebootable USB drive and booted. Then I selected the Shell terminal and followed the instructions that were offered at:
http://gnu-linux.org/how-to-permanently-add-linux-entry-in-uefi-menu.html
The whole process is well explained. After I was successfully booted, I re-ran that eEFInd program and it made settings to the sda1 boot partition.
My new Acer with the new generation processor and no legacy firmware option is booting and running 17.04 quite well now.