How to share an Internet connection over Bluetooth from the PC to the Phone [duplicate]
I guess this may work for you
http://blog.larsstrand.org/2009/04/sharing-internet-connection-over.html
While setting up the new device, check the box Use your mobile phone as a network device. After pairing with mobile phone, make sure to activate automatic connection. To do that, go to the bluetooth menu on your phone -> Paired device -> Scroll to the Ubuntu device -> Option -> Select "Yes" for "Auto-connect".
After that, on Ubuntu, click over the network icon on taskbar -> select "Nokia X2-00 Network". Now it is connected. You are done. Open the browser and try to open any page.