Broadcom STA Wireless drivers not working on Dell Inspiron 5420

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http://askubuntu.com – I'm new to linux. I just started working on ubuntu 12.04. Wifi is not working on ubuntu. It works on Windows 7 though. When I tried connecting to the net throght LAN it works. Also, through LAN I checked for additional drivers. There wer no drivers found. The command lspci -nn | grep 0280 gives me : 02:00.0 Network Controller [0280]: Broadcom Corporation Device [14e4:4365] (rev 01) Please help!!! (HowTos)