Thank you, I’m glad my expanation helped!
Debian-11 is quite old, so I did not expect that it would help and did not suggest to try it.
These are newly available Templates, you can install them with just one command, see here and here. However, without the Internet access, you would have to download them manually. I’m not sure how to do it… @adw is this possible?
Indeed, I forgot that you have no sys-usb. You can create it manually and add a USB controller to it, but be very careful here. As I explained above, one of your USB controllers (if you have two) is used to boot your system. If you add this one to sys-usb, you will break your system. You need to add a different one. But it can be hard to find out wihch one is which! Do not use automatic create with Salt, because it will put both controllers to sys-usb and break your system (which already happened to you before).
Actually, that link is about the WiFi, not Ethernet: How to enable WIFI on a NitroPC. To be installed in sys-net’s Template.
Exactly. Also, Qubes OS is a security-oriented OS, relying on compartmentalization. Running untrusted code in dom0 is a security risk.