[ubuntu] Internet speed slow with usb lan

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http://ubuntuforums.org – Hi, I was using 11.04 natty ubuntu and using USB LAN E-100U network adapter to connect internet. It has started giving me very slow internet speed but window works fine with USB. I don't want to switch to window just for internet speed. Please suggest me the way to improve internet speed. I have googled and found some tricks but still that does not help to get proper internet speed. (Hardware)