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[root@zeus]# iwconfig wlan0 mode master
Error for wireless request "Set Mode" (8B06) :
SET failed on device wlan0 ; Invalid argument.
I think it is not the 'iwconfig' command but the 'hostapd' itself which enables the Master mode.
So, don't worry if 'iwconfig' returns an error.
Your error seems that 'nl80211' driver has not installed properly.
Did you install drivers via debian package tool ( apt-get or aptitude ) ?
I installed them manually and succeeded turn Master mode ON , but previously when I tried with apt-get installer ,I can not turn ON to Master mode.