Strange error with Fern Wifi cracker...

[Nyk0n]

I have been trying to find a solution to the following error with Fern Wifi Cracker for most of the day. Can anyone shed some light on this?

Fern failed to start scan due to an airodump-ng error: ioctl(SIOCSIWMODE) failed: Device or resource busy ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211, ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make sure RFMON is enabled: run 'airmon-ng start wlan0 ' Sysfs injection support was not found either.

[JudasIscariot]

You need to put your card (wlan0) in monitor mode. That error message is telling you that the program can't inject because your card is in managed mode. To put your card into monitor mode:

aimon-ng start wlan0

And then you should have a mon0 interface for Fern-Wifi Cracker to use.

[twusted]

You need to put your card (wlan0) in monitor mode.

This is true.

I was getting "channel get ioctl failed 22" when with kismet and a Belkin PCMCIA wireless card

It worked when booting from live usb
It worked when installed to HD from CDROM (install from usb buggy ...)
It stopped working when I
apt-get update
apt-get upgrade

even when setting iwconfig wlan0 mode monitor

you have to
apt-get dist-upgrade

then you can set monitor mode

see here

http://ubuntuforums.org/showthread.php?t=1617065

cheers