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
make
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.

8 Replies to “How to install Realtek 8811CU Wireless LAN 802.11ac USB NIC on Ubuntu 19.04”

  1. Vasilij.
    Thank You very much. I can now use my Dual Band USB Adapter (8811CU on old Dell 780 with Ubuntu 18.04.4).
    But I can use only 2,4GHz option. Do You have any idea, how switch to 5GHz ?

  2. Thank You very much. I can use now 8811CU with old Dell780 and Ubuntu 18.04.4.
    But only in 2,4GHz.
    Do You have any idea how to switch to 5GHz?

  3. Thank You, I can now use my 8811CU with old Dell780 und Ubuntu Studio. One problem is, only 2,4GHz. Have You any idea, how to use with 5GHz?

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