[ubuntu] Koala in macbook 1,1

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http://ubuntuforums.org – Hey Guys! First time posting here asking some help. Normally I always found the answers here, but after a lot of searchs I've failed finding this answer. Well, after the installation the Karmic Koala in my MacBook 1,1 the first thing I notice is that my wi-fi is gone! Doesn't work anywmore! And WI-FI worked fine in the 8.10 and 9.04. So, anyone can help me? Btw: Apologize my english, i'm a little rusty. (Hardware)