Well it should not be that hard to connect a usb ethernet adapter to the 770. There are support for several usb ethernet adapters in the kernel sources already... it's just a matter of building/compiling a new kernel/module that supports the device you want to use. I haven't done it on my 770 (haven't found the need for it) but it's not that hard to do it on a regular workstation or a laptop, I've done it many times over the years i've been using Linux on my computers. So i guess it's not that much harder to do it for the 770.