Thanks for the FOSS link/help @mdooley. It has been very helpful in preparing/setting up 5 devices.
FYI - the Ubuntu/Mate (U/M) ltop terminal command "/sys/firmware/efi" couldn't find the folder, meaning (according to FOSS), that it's using BIOS (I think) I don't know if that is good or bad. But I'll use the BIOS version for U/M now.
Unfortunately my Win 7 doesn't show what FOSS instructions using System Summary lists on that particular line as described and shown in the image at the link @mdooley kindly provided. So I don't know what the Dtop does, except, I can break into BIOS at boot so I gather, it's BIOS when I install U/M alongside of Win 7.
NOTE: That I am doing a fresh install of Ubuntu on a existing Ubuntu/Mate machine and on three other ltops, removing Win 10 and installing Ubuntu/Mate. I'll be sure to check each one before installing U/M