Using AC600 Free Driver (0bda:c811) on Ubuntu

The in-kernel driver (rtw88_8821cu) recognizes but does not work, so we installed another driver.

Environment

• Ubuntu 22.04 (Kernel 6.5)

Wifi Adapter

USB-WiFi adapter purchased on AliExpress.

$ lsusb
Bus 001 Device 008: ID 0bda:c811 Realtek Semiconductor Corp. 802.11ac NIC

The main unit says “AC600 Free Driver” on it.

Install driver

Since the in-kernel driver (rtw88_8821cu) did not work, install another driver.

Execute the following command:

sudo apt install dkms
git clone https://github.com/morrownr/8821cu-20210916.git
cd 8821cu-20210916/
sudo sh remove-driver.sh
sudo sh install-driver.sh

/etc/modprobe.d/8821cu.conf is the configuration file.
If you look in it, you will see that the in-kernel driver (rtw88_8821cu) is blacklisted.

After installation, the adapter works when unplugged and plugged in.

Reference

• https://github.com/morrownr/8821cu-20210916