Wireless will not work in fresh ubuntu 12.04 lts installation

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http://askubuntu.com – I did a fresh Ubuntu 12.04 install on my Sony Vaio laptop, which worked perfectly with 10.04. Now my wireless won't work. I have read just about every Q&A on the subject and I have tried different solutions, including the official troubleshooting guides. My laptop is equipped with a Intel 5100 wireless device. Ubuntu recognizes the device and it's status is given as connected in nm-tool. I can ping the gateway, my own IP number and localhost. Rfkill shows no soft or hard blocks. Any ideas? I am just a few hours shy of reinstalling good old 10.04! Taake (HowTos)