Dell Inspiron 1521 no Wireless after install of ubuntu 11.10

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http://www.linuxquestions.org – I installed Ubuntu 11.10 on my dell Inspiron 1521 due to vista moving slowly but i had wireless with Vista. It told me 11.10 was not supported anymore so I upgraded to 12.04.3. Now I have no wireless connection. I hade no wireless connection with 11.10 either. I have a wired connection but no wireless. I have Ubuntu on two other machines in my home and they work perfect. if anyone can guide me through this on how to fix this it would be great. (HowTos)