Wireless USB Adapter 0bda:c811 Realtek Semiconductor Corp

sudo apt update
sudo apt install build-essential git dkms
git clone https://github.com/brektrou/rtl8821CU.git
cd rtl8821CU
chmod +x dkms-install.sh
sudo ./dkms-install.sh
sudo modprobe 8821cu

Talvez seja necessário instalar o firmware

git clone git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
sudo cp -r linux-firmware/rtl_nic/ /lib/firmware/
sudo update-initramfs -u

em kernel recente

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

Referências

• https://askubuntu.com/questions/39487/possible-missing-firmware-lib-firmware-rtl-nic-rtl8105e-1-fw-for-module-r8169-w
• https://askubuntu.com/questions/1162974/wireless-usb-adapter-0bdac811-realtek-semiconductor-corp
• https://askubuntu.com/questions/1162974/wireless-usb-adapter-0bdac811-realtek-semiconductor-corp