...
I setup using direct ISO loads.
Ubuntu Desktop
Easy and one via iso load. Just link to slimming down.
Windows 7
...
Windows 10
Not supported officially yet. Windows 7 is more than fine given it won't drop support for next few years. Unofficial here,
Instructions - http://bart.vanhauwaert.org/hints/installing-win10-on-KVM.html
Ubuntu KVM Guest Drivers - https://launchpad.net/kvm-guest-drivers-windows/+download