just did a fresh install and it seems that that didnt solved the issue.
The image file you downloaded and used to create your install media (USB flash drive or optical disk) may be corrupted.
You stated the you performed a fresh install, but if you booted the same installer media used in the first install, you did not start
from "scratch" as pirateghost recommended.
Choose
only one NIC port and plug in your cable before the install.
Download a
new image file and create
another flash drive or optical disk and perform another install.