'Joanna Anders' via qubes-users:
I'm trying to make Trezor Model T work on my Qubes system installed on a
ssd *usb drive* according to this guide Qubes OS - Trezor Wiki .
So by default the *sys-usb qube is disabled*. If I try to enable it my
whole system turns unusable.
Should I edit the *sys-net* qube instead of nonexistent *sys-usb* ?
If I'm not mistaken, running Qubes directly from a USB drive requires dom0 to own at least the USB controller responsible for the drive. This would mean you would have to run the trezor service there as well, but as dom0's networking is disabled, wouldn't get you any further. Unfortunately, think you pretty much require a sys-usb. If you have more than one controller driving the external ports (fairly unusual on laptops, though) you may be able to assign a single unused controller to a sys-usb qube and use the Trezor device on those specific ports. Not an option if your drive is on one of the same ports. Other option could be to install Qubes on local disk instead of USB.