Realtek RTL8811CU Wifi Dongle

How may I get the USB Wifi recognized and operational when I plug it in?

When I use the lsusb command it shows:
Realtek Semiconductor Corp.

For the manufacturer I know the driver is RTL8811CU

On the package I can read:

Dual band USB Adapter;
600 mbps;
2.4 GHz + 5 GHz;
USB 2.0 High-Speed;
IEEE: 802.11 ac;
Supported OS: Windows XP/Vista/7/8/10/Mac/Linux;

My Ubuntu OS is:

Ubuntu 18.04.4 LTS;
Release: 18.04;
Codename: bionic;

My linux kernel version is:

4.15.0-88-generic

2 Answers

It should work. Just open your network configuration manager and connect to your wi-fi hotspot.

In my case it is in Main menu -> Preferences -> Settings -> Wi-Fi:

If your adapter does not work, you could try:

• sudo apt install dkms -y

• sudo ubuntu-drivers autoinstall

• then

  Plug your USB-wifi-adapter into your PC
  If wifi can be detected, congratulations. If not, maybe you need to switch your device usb mode by the following steps in terminal:

  find your usb-wifi-adapter device ID, like 0bda:1a2b, by type:
  lsusb
  switch the mode by type: (the device ID must be yours.) Need install usb_modeswitch

  sudo usb_modeswitch -KW -v 0bda -p 1a2b
  It should work.

• or, if previous did not help:

  sudo apt install build-essential -y
  mkdir -p ~/build
  cd ~/build
  sudo apt install git
  git clone
  cd rtl8821CU
  make
  sudo make install

It works with mercusys ac650, but only in 2GHhz. It was a lot of work, so I'm so grateful for the help.

Do you know some way that can work with wifi 5GHz?, but either way I'm so grateful.

For those who have the same device that I have the 3rd option works.

sudo apt install build-essential -y
mkdir -p ~/build
cd ~/build
sudo apt install git
git clone
cd rtl8821CU
make
sudo make install