Install Tenda U9 wireless network card driver on ubuntu - pure handling - effective in actual testing

Download driver

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

Ps. A connection failure error will be reported. Just execute the above statement a few times and it will be fine.

Install the compilation tool gcc

sudo apt update
sudo apt install build-essential

Build and install

cd rtl8821CU
make
sudo make install

Check if the driver is installed

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

#If the following appears, the installation is successful
8821cu.ko

lsusb

#The list will appear
Bus 001 Device 006: ID 0bda:1a2b Realtek Semiconductor Corp.
Ps. I did not see the above when I used this command This, but using the following command will work.

Start the driver

sudo usb_modeswitch -KW -v 0bda -p 1a2b

or

sudo modprobe 8821cu

If the statement reports an error, reboot into the bios, turn off the secure boot option and re-execute the statement.

Automatically start the driver

sudo gedit /lib/udev/rules.d/40-usb_modeswitch.rules

Append LABEL="modeswitch_rules_end"the following before the end line:

# Realtek 8211CU Wifi AC USB
ATTR{idVendor}=="0bda", ATTR{idProduct}=="1a2b", RUN+="/usr/sbin/usb_modeswitch -K -v 0bda -p 1a2b"

If the above method does not work, try using the method in reference [3].

Reference materials
[1] How to use Tenda U9 wireless network card under ubuntu16.04
[ 2]Ubuntu installs Tenda U9 network card driver
[3] Ubuntu 20.04 configures TP-WDN5200H wireless network card< /span>