It’s not about USB devices. It’s about USB controllers. You didn’t choose to install sys-usb during install. I would reinstall Qubes and choose the option, rather than to manually create sys-usb afterward.
It’s not about USB devices. It’s about USB controllers. You didn’t choose to install sys-usb during install. I would reinstall Qubes and choose the option, rather than to manually create sys-usb afterward.