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I'm a Linux newbie, I've just installed Ubuntu 14.04 on my Dell Vostro 3560 with Broadcom wireless card. The problem is that I can't use wifi on Ubuntu 14 (also on Ubuntu 13.10). my network indicator show exactly like picture below

No wireless picture

Can you help me to solve my problem. Because I'm just a Linux noob, so I greatly appreciate if you guide me step by step... Thank you very much.

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possible duplicate of Installing Broadcom Wireless Drivers – chili555 Aug 16 '14 at 11:50

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