Step-by-step – Realtek RTL8168 Driver Ubuntu 21.04 Installation

Installing Apt Driver

2. 2. Installing RTL8168 Apt Driver

   Then to Install Realtek RTL8168 Apt Repo Driver
   Simply run:

   sudo apt install r8168-dkms

   And then Reboot with:

   sudo reboot

   In case of Issue use “apt remove” to delete it and then Reboot.
   But if Not found then See:
   How to Enable Universe Repo for Ubuntu GNU/Linux

   Add Universe Apt Repo for Ubuntu

   Universe Repository for Ubuntu Setup Guide