[ubuntu] no wlan after upgrade 10.04 to 12.04 LTS

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http://ubuntuforums.org – Inspiron 6400 intel pro/wireless 3945 working fine on 10.04 LTS, after upgrade to 12.04 LTS no longer working. Output of dmesg | grep wlan0 is empty output of rfkill list all shows neither hard nor soft block dmesg | grep iwl: shows nothing unusual iwconfig shows a wireless device wlan0 trying to use ifup wlan0 yields "ignoring unknown device wlan0" These are the results of about all of the tips I found during a 2h research. Is there anybody able and willing to help me? (Hardware)