LAN reconfig on Ubuntu Server post install

[Tom H]

On Mon, Dec 17, 2018 at 7:56 AM Ethan Evans <eevansnm2.0 at gmail.com> wrote:
>
> When I first installed and setup the server, I gave it a static IP
> address on the LAN and setup port-forwarding to it. But our home
> network has a dynamic IP address, so as long as I logged into the
> plex.tv website, I could get the IP address of the home network and
> SSH into the server. After installing the new motherboard, I booted
> the server and discovered the Plex app on my phone could not find the
> server. I then began trying to trouble-shoot on the server itself. I
> first tried to ping 1.1.1.1 and 8.8.8.8 (DNS servers) and those failed
> completely with the message: "connect: Network is unreachable." I then
> tried to ping 192.168.0.1 (the LAN router IP address) and it failed
> with the same results. Using the command ifconfig, I get the following
> (partial results): "inet 127.0.0.1 netmask: 255.0.0.0" I think
> expected results would've been something like: "inet 192.168.0.xxx
> netmask: 255.255.255.0" My guess is that the new LAN chipset or
> whatever on the new MoBo has reset the LAN settings for the server,
> but now I don't know how to set them again or if I might need to try
> and install different drivers for it to work.

Has the name of the NIC changed?