[GTALUG] Cannot get a network in Linux (Ubuntu) after using Windows 10

When I say I can't get a network, I mean that my Linux OS can't see any external hardware, including the router. And of course, I can't get the Internet. When in W10 (as I am now), I checked the router "config pages" and I noticed that it has two different IP addresses - one to the W10 hostname and one the Linux hostname, on the same machine. Any ideas?