I upgraded to Kubuntu 16.10 and now I cannot use my ethernet port at all, it is totally dead and does not recognize anything. I had been using 16.04 and had no problems at all! Please get back to me as soon as possible, as I use Linux as my main OS, and I don't have frequent access to Wifi either.
Attatch outputs from "nmcli -f all device show" and "nmcli -f all connection show"?
From the output you sent me I can see that your ethernet device is unmanaged by NetworkManager so that's the reason why you cannot use it. Go and report please this issue to NetworkManager in their bugzilla. NM bugzilla: https://bugzilla.gnome.org/page.cgi?id=browse.html&product=NetworkManager