[ubuntu] Update Manager Problem

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http://ubuntuforums.org – I keep getting this message "Your Ubuntu release is not supported anymore You will not get any further security fixes or critical updates. Please Upgrade to a later version of Ubuntu Linux. If I close this message Update Manager closes also. The Update Manager displays in a bar "Building Dependency Tree" but seems to be stalled as this has been going on for nearly an hour & the orange bar doesn't seem to be moving. Do I wait or what? What I'm trying / like to do is upgrade my 10.10 version of Unbuntu how should I go about this? One suggestion pointed me to, System>Adm (Hardware)