I'm not having any luck with the instructions in Wifi Docs/Ad hoc or Ad-hoc networking. I can't get ad-hoc wifi to work in Kubuntu 12.04 on a Thinkpad X220 with Intel wireless. All indications are that it should work. Any KDE users want to tell me how?

I plan to let other devices connect to my X220 to obtain files. I don't need to share the X220's internet connection. I just want it to act as a WiFi NAS. I would prefer to use WPA security (or better). I also want to do this via the GUI network manager.