Dirección primaria incorrecta.

Acabo de instalar un servidor nuevo con ubuntu 16.04 y 1.5.1, y cuando quiero crear el reseller, me tira el error Dirección primaria incorrecta. Y no puedo seguir, ayer me lo hizo con otro servidor, este con Debian 9.

I finished the installation correctly, but when going to create a reseller, I gave the error, I reinstalled the panel several times and one of them already let me do it. I had formatted the server because it happened to me on the panel, thinking that it would be something from the OS, but then it did the same to me, now it is already working.Thank you very much