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The supported interfaces of the network adapter include also AP. But when I try to set the card on Master Mode with iwconfig wlan0 mode Master, I get the following error:

Error for wireless request "Set Mode" (8B06) : SET failed on device wlan0 ; Operation not permitted

Is it still possible with hostapd? I tried to make it run with hostapd, but still no success. Any suggestions? I am trying to do this on Ubuntu 12.04.

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Please use the newer iw over the older iwconfig. Here is a similar issue posted in the Debian Bug tracker for changing ad-hoc mode, but I believe this applies to your master mode case as well: Debian bug #645055 –  gertvdijk Jan 21 '13 at 14:52
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