Enfach out the old and the new pure and the RPI reboots. That's it. There was no change in the required configuration. The two different USB WLAN sticks Edimax EW-7811Un and Edimax EW-7612UAn V2 run in parallel with the same version of hostapd (of course with different /etc/hostapd/hostapd.conf).
Oh yes, now I've written a little guide ,, how to operate the stick as an access point on Raspberry Pi:
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BTW: the antenna can also be the USB stick and turn not only cigarettes. She has there some catch steps.
BTW2: the Edimax EW-7612UAn V2 also works directly on Ubuntu 14:04 Trusty Thar