This is just a for what it is worth post. I was working/playing in Fedora 25 and fired up Boxes (a Gnome virtual machine software). I had the Endless installer created by Windows plugged in at the time. When I went to create a new machine in Boxes, Boxes found the EndlessOS img on the USB drive and offered to create a new virtual machine using the image. So I let Boxes go ahead and create a new virtual machine.
Boxes actually never struck me as being very good, but in this case it create an Endless virtual machine that works very well. I am typing this message in the machine. And this provides a very nice environment to explore Endless software applications.
Enjoy your day, bill