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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
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2 Answers 2

Reset to default
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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: enter image description here

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 https://github.com/brektrou/rtl8821CU.git
cd rtl8821CU
make
sudo make install
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  • 1
    Thank you very much for answering. But it didn't solve the issue. The point is that my OS isn't recognizing the USB dongle plugged in. Because I think there's no driver for it on the default list. So I asked for help: someone who owns the driver and could provide it to me and guide me through the driver installation.
    – Rafael Elias Grigolo
    Feb 19, 2020 at 2:13
  • Ok. I've edited answer. Could you try it?
    – Gryu
    Feb 19, 2020 at 2:33
  • Thank you very much for your time and help. It worked with the last par of commands you provided me (your "or" part). I really appreciate your help. Wish you all the very best!
    – Rafael Elias Grigolo
    Feb 19, 2020 at 2:50
  • No problem) Glad it helped. It's not mine solution, but driver author's
    – Gryu
    Feb 19, 2020 at 2:53
  • 1
    Even after more than 2 years the brektrou driver solution still needed for the device to work.
    – bansi
    Jun 24, 2022 at 4:42
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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 https://www.mercusys.com/en/product/details/mu6h the 3rd option works.

sudo apt install build-essential -y
mkdir -p ~/build
cd ~/build
sudo apt install git
git clone https://github.com/brektrou/rtl8821CU.git
cd rtl8821CU
make
sudo make install
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