I have a USB 3 Ethernet adapter that uses AX88179 and I did not have to install any driver for it as it was included in the kernel (as of kernel 3.9). That (Plugable brand) adapter works flawlessly. I have two other Trendnet brand adapters (Asix AX88179)that work flawlessly. An inxi output might help here in diagnosing and fixing the issue.