Well, I may have made the issue moot. I downloaded Linux Mint 19.3 and installed it. I thought I set it up as a "dual boot" with Win 10 still on the drive. But when I reboot, I don't get the option as to which to boot to. If Win 10 is gone - and all of my photos and documents with it! -- I may have screwed the pooch.
Before you do anything, see what partitions are on your disks. For instance, run `lsblk -f` Hopefully, your M$ partition is still separate and intact. It may be that your bootloader needs to be set up for dual boot.
