How to Install Realtek Rtl8812BU Driver Offline on Debian Bullseye – Step-by-step

Installing Requirements

1. 1. Launching Terminal App

   Open a Terminal Shell Emulator Window:
   (Press “Enter” to Execute Commands)

   

   In case first see: Terminal QuickStart Guide.

2. 2. Finding Linux Headers

   Now to find the needed Linux Headers Release
   Check your current Kernel Version with:

   uname -r

   And take Note of it.

3. 3. Downloading Linux Headers

   Download Linux Headers for Debian Bullseye GNU/Linux

   Linux Headers for Debian

   Downloading Linux Headers for Debian

   Ctrl/Cmd+f to Search for “linux-headers” on Browser.
   But if you Do Not find the Matching Versions then see instead: Installing Debian Bullseye Kernel without Internet.

4. 4. Installing linux-headers Offline

   Then to Set up linux-headers Offline on Debian
   First, access the Target USB Driver or Location:

   cd /[path/2/linux-headers]

   But if you are in Trouble to Find it out on Terminal then See: How to Access USB Device.
   To Check the Package is there:

   ls | grep headers

   The grep Command Refine the output List showing only the entries Matching the Keyword.
   Then simply play:

   sudo apt install ./linux-headers*.deb

   Or:

   sudo dpkg -i ./linux-headers*.deb

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.

5. 5. Downloading Dependencies

   Download Required Packages for Debian GNU/Linux

   Packages tar.gz Archive

   Downloading Packages for Debian

6. 6. Installing Dependencies

   Then to Install Required Stuff
   First, access the Target:

   cd /[path/2/usb]

   Then to Extract the Stuff:

   tar xvzf ./dkms*.tar.gz

   And then to Install all the included Packages play:

   sudo dpkg -Ri ./dkms*

   Again in case of issue try:

   sudo apt -f install

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.
   And then Reboot your System with:

   sudo reboot