Error for wireless Request "Set Mode" (8B06) Problem resolution

At the time of running the following command, an unexpected error, the last Google, finally determined the reason, because when the command is run, my wireless card is working.

Many people on the Internet that is because of the driver of the network card is actually not the reason.

# iwconfig Wlan1 mode Ad-hoc  
Error for wireless request ' Set Mode ' (8B06):  
      
set failed on device wlan1; Device or resource busy.

So, after manually disconnecting the wireless card, run the following command:

#ifconfig wlan1 down  
#iwconfig wlan1 mode Ad-hoc

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