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As above. I tried alot of the solutions i found in the forum but have had no success. Sorry i'm a bit of a newbie with linux!!

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Tell us the model of your Wireless card by appending this command in your terminal: lspci | grep Network – Hanynowsky Sep 5 '12 at 19:48
Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. – fossfreedom Sep 5 '12 at 19:52

I have that same laptop and had the same problem:

  1. Connect to the internet using a modem or cable
  2. Use the command sudo modprobe b43 and see the outcome.

If it doesn't work, open a terminal by opening the Dash and typing terminal and clicking on the terminal icon that appears. Then type:

sudo apt-get remove --purge bcmwl-kernel-source
sudo apt-get install firmware-b43-installer

Restart computer.(The change only take place when you restart.) Thanks to our friend Karl for this.

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