Further reading of old bug reports suggests that for many the proper solution is to simply uninstall all bcmwl-kernel-source and broadcom-sta-* packages so that the in-tree driver will be used. e.g. http://catlingmindswipe.blogspot.com.br/2012/07/broadcom-wireless-fix-for-ubuntu-1210.html
Further reading of old bug reports suggests that for many the proper solution is to simply uninstall all bcmwl-kernel-source and broadcom-sta-* packages so that the in-tree driver will be used. e.g. http:// catlingmindswip e.blogspot. com.br/ 2012/07/ broadcom- wireless- fix-for- ubuntu- 1210.html