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Possible Duplicate:
Broadcom 4313 Signal strength very low on an HP Pavilion dv4

I installed fresh Ubuntu 11.04 and i have wireless connection but i have to be very close to the router to have signal. I looked everywhere i can't manage to find a solution. In my grub it says that i have : 3.1.4-030104 generic
old ones :
3.0.0-14 generic
3.0.0-12 generic
kernels.

I tried the solution here but i think this is for older versions of Ubuntu. On Windows 7 the wireless card is working flawlessly. Please help me to find a solution I'll be grateful.

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