Dear Radek,
Thank you for your answere, but I guess I couldn't make my point here. I didn't connect the RPI to the router over WLAN. I changed nothing on the system. The AP just won't show up.
Now I made a fresh new install of astroberry. Downloaded the new image and did the update && upgrade stuff. Even the first dialog where I had to set my keyboard and so on. But the AP is not showing up. I am attaching some pictures of the situation. At the moment the RPI is connected over Ethernet to the router.
I hope that this time I could made my point.

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