I have the same problem:
00:0b.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g]
802.11g Wireless LAN Controller (rev 02)
Subsystem: AMBIT Microsystem Corp. TravelMate 2410
Flags: bus master, fast devsel, latency 64, IRQ 17
Memory at e2000000 (32-bit, non-prefetchable) [size=8K]
And no networks showing up in the network monitor. Sometime it works but
it is not stable, at a few hours wireless network is not available
anymore. My WindowsXP laptop keeps on going so wireless router is set up
correctly.
** Attachment added: "screenshot of networkmanager"
http://launchpadlibrarian.net/17134981/nonetwork.png
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Hardware drivers show Broadcom B43 Wireless Driver in use, but wireless
doesn't show in Network Manager
https://bugs.launchpad.net/bugs/191408
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