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I have the same problem with my Dell d420 and the wlan is not working.

jenus@jenus:~$ iwconfig lo no wireless extensions. eth0 no wireless extensions.

jenus@jenus:~$ lspci -vnn | grep 14e4 09:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme BCM5752 Gigabit Ethernet PCI Express [14e4:1600] (rev 02) 0c:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01)

0c:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01) Subsystem: Dell Wireless 1390 WLAN Mini-Card [1028:0007] Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at efdfc000 (32-bit, non-prefetchable) [size=16K] Capabilities: Kernel modules: wl, ssb

Any idea how can I solve this issue???

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please can you add rfkill list all and sudo lshw -class network to your question. thanks. –  fossfreedom Jan 2 '12 at 22:28
    
OP are you still looking for an answer? If so, you may need to repost your question as this is flagged for closure. Regards, –  Ringtail Apr 7 '12 at 1:14
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1 Answer

Yes look at this link:

http://www.computerandyou.net/2011/05/how-to-solve-no-wireless-networks-in-ubuntu-11-04/

Alternate solution 1 solved it for me.

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