How to install Realtek 8811CU Wireless LAN 802.11ac USB NIC on Ubuntu 19.04

Before build this driver make sure make, gcc, linux-header and git have been installed.

Step 1: Clone brektrou repository

mkdir -p ~/build
cd ~/build
git clone https://github.com/brektrou/rtl8821CU.git

Step 2: Build and install

cd ~/build/rtl8821CU
sudo make install

Step 3: Check installed driver

If you successfully install the driver, the driver is installed on /lib/modules//kernel/drivers/net/wireless/realtek/rtl8821cu. Check the driver with the ls command:

ls /lib/modules/$(uname -r)/kernel/drivers/net/wireless/realtek/rtl8821cu

Make sure 8821cu.ko file present on that directory.