I went through the instructions for installing ubuntu server on a windows 10 machine and ended up with: `Boot Device Not Found Please Install an operating sytem on your hard disk.` Couple of steps in the install that were not clear: 

* The whole partitioning thing generally. I freed up space in Window Disk Manager, but then the install wasn't clearly letting me chose that space.
* The step with GRUB near the end of the install was already telling me that there is no other OS.

Now what?. I now have an unusable machine.