[ubuntu] Atheros WiFi problem

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http://ubuntuforums.org – Hi, Having just installed Ubuntu 9.10 on my acer laptop, I have realized that the wireless internet is ineffective. My computer states that I have about 50% signal strength, yet I cannot access any web pages as the connection 'times out' before the page loads. My wireless is made by Atheros, can anyone help me? Thanks :D BTW, i'm completely new to this stuff! (Hardware)