No usb qube if installing on an external SSD (and internet is on usb)

I installed Qubes OS on an external SSD (on a usb hub) on my laptop
I must use an usb to ethernet adapter to access the web (there is no working internet adapter on the laptop)

At the installation, the option to create an usb qube was disabled
[it was saying disable become booting from a usb -ssd device or something similar]

At run time, no usb qube to handle the usb_to_ethernet , so no internet access
What should I do?

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Related:

Install Qubes OS on the Lenevo IdeaPad 320’s internal drive when you are ready to flush your old OS instead.