Broadcom 4311 wireless driver Ubuntu 12.04

Sat Sep 8 18:30:55 UTC 2012

Hello Linux users,
My sisters laptop a HP6515 with a Broadcom 4311 wireless network card an STA in Ubuntu gives problems.The internet connection freezes an also with checking of e-mail.Does anyone have a solution for better performance with Ubuntu?
Dennis 		 	   		  
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