Try typing airmon-ng start wlan0 or airmon-ng start eth0

hey pals...I solved my problem...here is solution:

I downloaded little software called uNetBootin, and I made bootable USB flash drive with ISO image of my back|track final, restarted, and...

I wrote in previous post that my MD5 is correct, I burned ISO image on 3 different DVDs...and also with 2 different software...and with different speeds - min 2x two times and max 8x last DVD...
...

Hi everyone!

I have kind of problem with back|track 4 final release...i downloaded ISO image from download section, burned it down on DVD, twice (two DVD s) to make sure that installation can go...