Upgrade of ubuntu 11.04 natty

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http://ubuntuforums.org – hello, I have an old release of ubuntu (11.04 natty) so I cannot get package by sudo apt-get install <package>. I think this problem come from the version of ubuntu installed on my computer. So I tried to upgrade, but I get error: Code: Your ubuntu release is not supported anymore in the update manager. So I would like to get help from you about this upgrade. I tried to search on google, I found this page: https://help.ubuntu.com/community/UpgradeNotes but when I click on the link corresponding to my release, the page doesn't exists anymore. Please help me. Kronk. And sorry for (Hardware)