How to Configure Realtek RTL8191SU WLAN USB to allow Reaver Usage ?

[sc0de]

Hello Kali-Linux Form

I am back using Linux after a break and i have installed Kali-Linux in VirtualBox
I really want to lean how to use reaver and aircrack-ng
I bought i realtek RTL8191SU wlan USB for this purpose
But apparently I need to patch the original chipset driver of my realtek RTL8191SU to allow packet injection for reaver usage.

I really need help in learning how to patch my realtek RTL8191SU driver
ca someone help me to do this please. I have read up extensively but i am now getting the patch process completely wrong because of info overload.

can someone tell me how to configure my realatek RTL8191SU driver to allow Reaver usage and packet injection ?

Where do i download the driver i need from (i thought it was already installed and ready to go on kali-linux. am i wrong here ?

how do i download, build, configure and install the new driver correctly ?
How to do i patch the driver correctly ?

I am looking forward to getting help and learning about this issue im having.

Thanks for any help in advance.

[sc0de]

Im still having trouble with this USB wlan card

iwconfig shows:
wlan0 unassociated Nickname: "rtl_wifi"
Mode:Managed Access Point: Not-Associated Sensitivity: 0/0

even when i try
sudo ifdown wlan0

i get :
ifdown: interface wlan0 not configured.

iwconfig wlan0 mode monitor
gives me:
Error for wireless request "Set Mode" (8B06) :
SET failed on device wlan0 ; Invalid argument.
sudo iwconfig wlan0 mode monitor.

im still a newb but im trying to learn about this issue.
but i need help understanding why my card is not working on aircrack-ng on Kali-Linux i though it should work straight out of the box on kali-linux without and configuring. although it looks lie this is not the case.

what do i need to do to get my usb wlan card to work in monitor mode ?