I'm not sure it is exactly the same as this, but my wireless (which
worked fine in Maverick) now cannot see my wireless router. It does pick
up some other wireless router nearby, but not my own. I know that my
router is working because my phone will connect to it and route fine
(and range isn't an issue as I'm in direct line of sight about 2m away).

sudo lshw -C network
  *-network               
       description: Wireless interface
       product: BCM4312 802.11b/g LP-PHY
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth1
       version: 01
       serial: 00:24:2b:e3:94:18
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical 
wireless
       configuration: broadcast=yes driver=wl0 driverversion=5.100.82.38 
latency=0 multicast=yes wireless=IEEE 802.11bg
       resources: irq:16 memory:55100000-55103fff

rfkill list wifi
0: brcmwl-0: Wireless LAN
        Soft blocked: no
        Hard blocked: no

iwconfig
lo        no wireless extensions.
eth0      no wireless extensions.
usb0      no wireless extensions.
eth1      IEEE 802.11  Access Point: Not-Associated   
          Link Quality:5  Signal level:0  Noise level:0
          Rx invalid nwid:0  invalid crypt:0  invalid misc:0

uname -a
Linux ace-garp 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 
i686 i686 i386 GNU/Linux

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https://bugs.launchpad.net/bugs/730972

Title:
  IdeaPad U160 Broadcom wifi not connecting

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