How to Install Realtek Rtl8812BU Driver Offline on Kali 2021 – Step-by-step

3. Downloading Linux Headers

Download Linux Headers for Kali 2021 GNU/Linux

But if you Do Not find the Matching Versions then see instead: Installing Kali Linux 2021 Kernel without Internet.

4. Installing linux-headers Offline

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

cd /[path/2/linux-headers]

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. Downloading Dependencies

Download Required Packages for Kali GNU/Linux

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