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Install Realtek rtl8812au driver

 1. If you already installed Ubuntu rtl8812au-dkms driver and it stopped working after the latest kernel update, then you will need to remove the driver first:

sudo apt remove rtl8812au-dkms

2. If you installed other dkms packages related to rtl8812au, then remove them as well

sudo dkms status

sudo dkms remove rtl8812au/x.x.x –all

Replace x.x.x with the version number of the package

3. Clone and install the driver from Gibhub

sudo apt update
sudo apt install git
git clone https://github.com/gnab/rtl8812au.git
sudo dkms add ./rtl8812au
sudo dkms build rtl8812au/4.2.2 (if you get an error saying ‘rtl8812au’ folder does not exist, then change rtl8812au to ‘8812au’)
sudo dkms install rtl8812au/4.2.2 (if you get an error saying ‘rtl8812au’ folder does not exist, then change rtl8812au to ‘8812au’)

4. Load the driver

sudo modprobe rtl8812au (or 8812au if you get an error message saying rtl8812au does not exist)

Now your Wifi dongle should work and you can use it to connect to your 5G network in Network Manager.

Reference: https://ubuntuforums.org/showthread.php?t=2386168

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