No Wireless on Thinkpad T41 with Ubuntu 12

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http://askubuntu.com – I just installed Ubuntu 12 on my old Thinkpad T41. I've done this once before but back then I installed Ubuntu 11 first and upgraded to 12. This time I've used the Mini iso file. Before the wireless worked perfect without any tweaks, but now, it's checked off as enabled in the notification area, but I can't see any wireless networks. If I do "nm-tool" I can see that for the device "wlan0", the driver "ath5k" is used, but it has "state: unmanaged" Does anyone knows what to do? Thanks :-) (HowTos)