RTL8156 USB2.5G Ethernet Adapter on Ubuntu 20.04

Download: https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-usb-3-0-software

Extract the downloaded drivers

sudo tar -xvjf r8152.53.56-2.15.0.tar.bz2 -C /usr/src/

Create a DKMS.conf file