[ubuntu] Wired Internet is nto working properly

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http://ubuntuforums.org – .it says it's connected but when i surf through my browser, the pages are not available and i keep clicking refresh for 40 times (LITERALLY!) i got it working then after browsing for about 20 pages the internet is not working again and same process again on getting back the internet, and then I downgraded to ubuntu 10.04 LTS because it is supported for a long time! and now it's even worse, the internet won't work even I press the refresh button for 40 times, sometimes it works when you restart it and just for your info, again, I tried to ping using terminal, it doesn't ping properly, and just (Hardware)