Unable to unload MadWifi module

Hi,

For some reason, Im not able to run the script madwifi-unload inspite of 
sudoing.

ayb@AdLenovo:$ sudo ./madwifi-unload
[sudo] password for ayb:
sudo: unable to execute ./madwifi-unload: Permission denied

Any reason why this should happen?

Thanks
regards,
Aditya Bhave


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