On Sun, Jan 20, 2019 at 11:16:10PM +0100, kit...@tutanota.com wrote:
> Upon reading the system requirements and recommendations, I read the 
> statement "A non-USB keyboard or multiple USB controllers".  Please explain 
> the reasoning there.  Thank you.
> 

Qubes offers USB isolation from dom0, using a sys-usb qube.
If you only have one USB controller, and a USB keyboard, then you have to
have the USB keyboard available in dom0, or you will not be able to
unlock the encrypted disk.
This means that *all* USB devices will be attached to dom0, so you are
missing out on the protection offered by sys-usb.
Have a look at https://www.qubes-os.org/doc/usb particularly the warning
on USB input devices.

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