[ubuntu] Internet too slow

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http://ubuntuforums.org – OS : Ubuntu 11.10 Environment : Gnome 3 and Unity Well , I am not a network expert . My problem is network too slow in Ubuntu . My internet connection is a 512kbps one (60 KBPS ) its downloading speed if its fine but now i am getting maximum 25KBPS . from the day when i have installed (recently i think from 3-4days back i switched to 11.10 before that 10.04& net fine with that) .At the day i have installed Ubuntu , i went for an update but its started with too slow speed . I thought that server issue so i switched to best server option and choose the best one .but my problem n (Hardware)