[ubuntu] No wireless on Ubuntu 12.04 Dell Inspiron

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http://ubuntuforums.org – I have recently installed Ubuntu 12.04(dual-boot)and I'm not able to connect to internet using Wifi since. Wifi works fine on Windows 7. I have watched a couple of videos on youtube about connecting to the wifi but no help. I'm doing exaclty as told in this video and nothing else http://www.youtube.com/watch?v=XN8PrEbmct8. My wifi is WEP 64Bit. (I know it's very insecure but still) DELL Inspiron 15R 5520 I read some of the other posts also but no help since last night. I'm a noob so please help. Really looking forward for some reply. (Hardware)