[ubuntu] Aircrack problem

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http://ubuntuforums.org – Hello, first off im using a laptop with Interface:wlan0 Chipset:Atheros Driver: ath9k - [phy0] Aircrack-ng has been installed and im following this guide and when i have to enter the command sudo airodump-ng mon0 I get the following Interface mon0: ioctl(SIOCGIFINDEX) failed: No such device What does this mean? Google has not helped me enough on this one. (HowTos)