Kali 2.0 and the new aircrack-ng v1.2 RC2 has many new options but also has been throwing out strange errors.
For example after putting a wireless adapter into monitor mode I was getting a error while trying to use airodump-ng saying “ioctl(SIOCSIWMODE) failed: Device or resource busy”
After reading through the forums I found a way to fix it with the following commands.
Here are the commands to fix it.
ifconfig wlan0mon down
iwconfig wlan0mon mode monitor
ifconfig wlan0mon up
After running the above command “airodump-ng wlan0mon” should now work and go out and find AP points.
I am still looking into a more permanent solution but this does work for now.