Here is a work around for ya, use 10.10's bcmwl-kernal-source:
http://packages.ubuntu.com/maverick/bcmwl-kernel-source

Remove the old one, and after you install the one from maverick be sure
to hop on synaptic, find bcmwl-kernal-source again and goto "Packages >
Lock Version" after you have found and highlighted it. This is to
prevent any accidental upgrades back to natty's version which would once
again break it.

Once all is done you could restart, or just wait patiently for it to
refresh and connect/supply nearest wifi locations.

Source: 
"http://ubuntuforums.org/showthread.php?t=1700897&highlight=BCM4312+Natty&page=2";
 Post 14.
(Worked for me, I have a bcm4312.)

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https://bugs.launchpad.net/bugs/711397

Title:
  package firmware-b43legacy-installer 4.178.10.4-5 failed to
  install/upgrade due to unsupported hardware

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