Can't upgrade ubuntu server from 10.04 LTS to 12.04 LTS

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http://askubuntu.com – I'm trying to upgrade my 10.04 server using do-release-upgrade, but it keeps saying there is no new version available. If I change the prompt config in /etc/update-manager/release-upgrades to normal, I am able to upgrade to 10.10 though, but I don't want to perform 4 separate upgrades in order to reach the new lts. (HowTos)