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How to get BCM4312 driver to work properly?

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http://askubuntu.com – I have a Dell Laptop on which wireless and every thing used to work perfectly.Today morning I noticed the suddenly there is no wireless at all. On a working condition I used to have folllowing lspci -vnn 0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01) Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c] Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at f69fc000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: wl Kernel modules: wl, ssb and /etc/lsb-re (HowTos)