aircrack-ng AP is on channel -1

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http://askubuntu.com – I am trying to crack my WEP key for some days now, and after reading a number of tutorials, I find myself stuck on the same spot all the time. My wireless adapter chipset is the RTL8188CE, and my system runs ubuntu 11.10. I ran the aircrack-ng.org injection test and everything ran ok, showing me that my card is enabled for injection. So I follow the aircrack-ng newbie tutorial. I run: sudo -i [password] airmon-ng stop wlan0 After this, iwconfig outputs: root@ubuntu:~# iwconfig lo no wireless extensions. eth0 no wireless extensions. wlan0 IEEE 802.11bgn ESSID:off/any (HowTos)