@mitu It didnt work. The lights keep flashing as if it was searching for a player (1,2,3,4)

Can you add more info about your setup, as requested in https://retropie.org.uk/forum/topic/3/read-this-first ?
I assume that by Xbox 360 you mean a controller for Xbox 360 - is it an original controller or a compatible one ? Do you know the make/model ?

I have this controller, It is the case linux does not have the usb dongle drivers it works fine in the usb though without the wireless adapter

@endor read last post. If it is not saving and need to be reconfigured everytime you have a permissions problem. If you do have to redo this everytime then hook up a keyboard, press f4. It should take you to console. Type

sudo chown pi:pi -R /opt/retropie/configs/

If it says something that appears that that failed try it without the -R.

sudo chown pi:pi /opt/retropie/configs/

Then restart the pi. Then you will have to configure the controller one last time.

@dudleydes got it to work!

I added input_toggle_fast_forward_btn = "7"
but not to the retroarch.cfg 's

I added it to
/opt/retropie/configs/all/retroarch-joypads

then the .cfg for the joypad, which is " Mad Catz Xbox 360 Controller.cfg "

now right trigger works as FF when combined with hot key for all libtretro systems.

thanks for the help

@sagoannahs
You can also use the Configuration Editor (instead of editing /opt/retropie/configs/psx/retroarch.cfg manually)

RetroPie Setup Script >> Setup / Configuration >> Edit RetroPie/RetroArch Configurations

More information (with pictures) here:
https://retropie.org.uk/docs/Configuration-Editor/

@cortex91 I am using 4.1 but I am still having this problem.

Thankyou Thankyou Thankyou!

I will have a read through it.. absolute legend! Thanks