[quote]
my sys-net is also sys-usb because I used the USB ethernet adapter so I
think this is the problem but I don't know how to fix.
[/quote]
I doubt that this is the problem.
Have you assigned the device to sys-net in the "devices" tab of sys-net
settings.
When sys-net boots up, can you run `sudo journalctl -b ` in sys-net and look for
any entries relating to networking devices.
It may be that you need specific drivers for the NIC, so knowing what it
is would be a help.