Step-by-step – Realtek Rtl8812au Driver Ubuntu 21.04 Installation

Installing

3. 3. Installing Dependencies

   Then to Install Required Packages
   First, preferably Upgrade your System with:

   sudo apt update && sudo apt upgrade

   In this case then Reboot it using:

   sudo reboot

   Then run:

   sudo apt install build-essential linux-headers-$(uname -r) dkms unzip git

   Authenticate with the User Admin Pass.

4. 4. Downloading Realtek rtl8812AU Driver

   Download Realtek Driver for Ubuntu GNU/Linux

   Get Realtek rtl8812au Driver for Ubuntu

   Realtek Driver Source Realtek for Ubuntu

   Or better Clone it with Git.
   Especially relevant: in the New Posts Revision I have included a greate Alternative to the default gnab Driver.
   So, in case of the aircrack-ng choice then follow the Github Developer Documentation to setup it.
   Especially relevant: the Aircrack-ng release include support for “Monitor mode” and “Frame injection“!

5. 5. Extracting Realtek RTL8812au Driver

   And then Extract Driver Archive into /tmp
   (Skip in case of Git Checkout)
   Possibly Double-Click/Right-Click on Package and Open with Archive Manager:

   
   Or from Command Line:

   unzip -d /tmp/ ~/Downloads/*master.zip

6. 6. Installing Realtek RTL8812au Driver

   Then to Install rtl8812AU Wi-fi Driver for Ubuntu
   Access the Target folder:

   cd  /tmp/*master

   Or in case of Git Checkout:

   cd rtl8812au

   To Make it:

   make

   Then to Test the installation run:

   sudo insmod 8812au.ko

   And then to Setup just Copy the Module into the Right Location with:

   sudo cp 8812au.ko /lib/modules/$(uname -r)/kernel/drivers/net/wireless

   And finally, Update Module Depencencies:

   sudo depmod

7. 7. Setting Up DKMS

   Next to Add 8812au to DKMS modules
   So it Automatically Rebuilds and Install on Kernel Updates.
   First, Copy the Source into /usr/src:

   sudo mkdir /usr/src/8812au-4.2.3

   sudo cp -r ./* /usr/src/8812au-4.2.3/

   And the Setup it:

   sudo dkms add -m 8812au -v 4.2.3

   sudo dkms build -m 8812au -v 4.2.3

   sudo dkms install -m 8812au -v 4.2.3

   Now to Check the Status play:

   sudo dkms status

   Finally, possibly to Automatically load at boot run:

   echo 8812au | sudo tee -a /etc/modules

   Thanks to gnab inestimable Work!

So Now I’m truly Happy if My Guide could Help you to Install Realtek rtl8812au Driver on Ubuntu 21.04!