Download source:
git clone https://github.com/ivanovborislav/rtl8812au.git
cd rtl8812au
Download patch:
wget https://raw.githubusercontent.com/ivanovborislav/document/main/patch/add_support_rtl8821AU_to_rtl8812AU_v5.13.6_driver.patch
Patch:
patch -p1 < add_support_rtl8821AU_to_rtl8812AU_v5.13.6_driver.patch
Compile:
make
sudo make install