Ubuntu 18.04 No Wi-Fi Adapter Found - Realtek driver rtl8821ae
Solution 1:
you can install the latest Realtek drivers from this repository https://github.com/lwfinger/rtw88
sudo apt-get install linux-headers-generic build-essential git
git clone https://github.com/lwfinger/rtw88.git
cd rtw88
sudo make install
sudo modprobe rtl8821ae