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[ubuntu] Can't enabel wireless

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http://ubuntuforums.org – Hi, I've installed ubuntu 12.04 on my Dell vostro 1520. I think that I've already installed the driver. I did: Code: sudo apt-get install firmware-b43-lpphy-installer After rebooting, I still could not enable the wireless. What should I do next?? Thanks in advance! Code: >>sudo lshw -class network     *-network                    description: Ethernet interface       product: RTL8111/8168B PCI Express Gigabit Ethernet controller       vendor: Realtek Semiconductor Co., Ltd.   (Hardware)