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Like the suggestion in that link says, if your wireless network card is not now supporting open source drivers, the best and easiest solution is to get one that does.
“Every atom in your body came from a star that exploded and the atoms in your left hand probably came from a different star than your right hand. It really is the most poetic thing I know about physics...you are all stardust.”― Lawrence M. Krauss A 1792 U.S. penny, designed in part by Thomas Jefferson and George Washington, reads “Liberty Parent of Science & Industry.”
Odds are, if you are making this post, I bet you are having issues with a Broadcom chip. NDISwrapper may not work for you, you may wish to use a b43 driver. neither of which worked for me on a couple computers. good luck! let me know if you figure something new out!