The following are all facts:
I run Windows 10 Pro.
My copy of Ubuntu 15.04 was downloaded in July. I used to "try it out".
I had initial difficulties setting up Hyper-V in Windows 10 Pro. A kind...

I read and followed your own illustrated instructions carefully in both setting Hyper-V in Windows 10 and setting a Ubuntu 15.04 Virtual Machine.

I did not make "simple user errors" because it was...

Hyper-V was successfully setup.
But attempts to setup ubunto 15.04 repeatedly and miserably failed.
(I followed your instructions for setting up Linux & Ubuntu in Hyper-V Windows 8.1 host).
...

I tried to follow your clear and nicely illustrated instructions above.
I checked <Hyper-V> in <Windows Features> and pressed OK.
I repeated this several times with rebooting my system and every...

I previously used VMWare Workstation 10 on Windows 8.1 x64.
When I uninstalled VMWare Workstation 10 I found the following:

Irreversible changes to Windows 8.1 system setup
A huge number
...