backtrack 4 beta USB

[alessandro]

I have installed BT4 beta on USB. Wifi doesn't work. I know that BT4 is ubuntu-based. I had the same problem in ubuntu 8.10.
In ubuntu I changed /etc/modprobe.d/options file.
My question is:

-how can I modify /etc/modprobe.d/options in a USB live?
I modify the file using the usb, but when I reboot the usb, the file is not modified.

Thanks,
Ale

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