[ubuntu] No Wi-Fi

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http://ubuntuforums.org – I installed Ubuntu 9.10 on my Acer 5315 laptop, no Windows, just Ubuntu, so far everything works fine, except for the in-built Wi-Fi, the Wi-Fi indicator lamp isn't lit, and t won't pick up any networks. I've temporarily fixed the problem by using a USB Wi-Fi key, but would still like the internal Wi-Fi to work. Perhaps some drivers or something would help? TIA (Hardware)