VirtualBox stuck on Windows Logo
Try disabling paravirtualization:
Settings -> System -> Acceleration -> Paravirtualization Interface: None
I was able to start installation of Windows 10 (64bit) on VirtualBox 5.0 Ubuntu by disabling this feature.
I removed VirtualBox 5.0 and installed the Oracle VirtualBox 5.1 and it went through. No other options helped.
I ran into the same problem, and changing paravirtualisation did not help. I had also installed the virtualbox-ext-pack package (Ubuntu host) and enabled USB3.
Unchecking the following allowed me to install: Settings > USB > Enable USB Controller