wifi nd audio not working

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http://askubuntu.com – I'm using dell inspiron 1545 came with vista, I've been using windows 7 in that from a while. Now I installed ubuntu parallel with Windows 7 in other drive. Problem is I cant connect to my wifi (dont have wired connection). Nd 'rhythmbox' give me message phython (v2.7) plugin could not found I tried each and every command posted based on this problem, but no use. Ex: sudo apt-get install bcmwl- kernal-instal-source When I entered this command in terminal I'm getting error message that says E:unable to locate package bcmwl-kernal-source I'm really exasted with this, could some one (HowTos)