I was creating a wifi hotspot using kde-nm-connection-editor as instructed on Share Internet Connection With Android in Ubuntu 14.04 but an unexpected error occurred as a result of which I was able to create it up. The following error appeared :
(32) Access Point (AP) mode is not supported by this device.
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Aditya Prasun
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possible duplicate of How to setup an Access Point mode Wi-Fi Hotspot? – user68186 Jan 29 '15 at 18:48
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As @Zeiss Ikon said, it seems that it doesn't support AP mode. Sadly this happens to me too.
You can run in a terminal iw list
and check the Supported interface modes: section to see if there is any reference to AP. If not, then you can't use the AP mode.

Diosney
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That error is reporting that your particular wifi hardware doesn't support operating as a hotspot. There's nothing you can do in software to correct it, you can only replace the hardware (though it would probably cost about the same to buy a cheap wifi router).

Zeiss Ikon
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I guess I should have said "is telling Ubuntu that it doesn't support operating as a hotsport". It's possible, in this case, that you need a different driver. – Zeiss Ikon Jan 29 '15 at 19:42
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I came with the same issue. Windows works just fine, but Ubuntu seems not able to start the hotspot. Even though if I saw "AP mode" in the iw list. Why does it happen? – Bálint Pap Aug 31 '16 at 21:52