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installed Ubuntu 12.04, updated, installed drivers and have been trying to enable the wireless from terminal but no luck. I am using a Lenovo B570 laptop with a Broadcom BCM 4343 802.11b/g/n Wireless Lan Controller. Again Wireless networking is disabled and refuses to re-enable even tho I never had

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Please run lspci -nn and rfkill list all. Please edit your question to add the details relating to your Broadcom wireless. –  chili555 Nov 17 '12 at 2:18
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