Cant find the Atheros AR242x / AR542x driver for ubuntu 12.04.2

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http://askubuntu.com – I've just installed Ubuntu 12.04.2. Wired internet is no problem. When i go to additional drivers (when i'm wired conected) i don't get a list of proprietary drivers. So i want to search the driver by my self but can't find im. Can sombody help? Wlan chipset: atheros ar242x ar542x wireless (pci express) thx. (HowTos)