Upgrade Ubuntu server 11.04 to 11.10 fails

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http://askubuntu.com – I'm trying to upgrade our ubuntu server 11.04 to 11.10. I did an apt-get update and apt-get dist-upgrade. Now, im trying to execute do-release upgrade. This is the error i get: Err http://archive.ubuntu.com/ubuntu/ oneiric/main librpmsign0 403 Forbidden: IPS signature match [IP: 80] This is the full output: root@zienix:/var/cache/apt# do-release-upgrade Checking for a new ubuntu release Your Ubuntu release is not supported anymore. For upgrade information, please visit: http://www.ubuntu.com/releaseendoflife Get:1 Upgrade tool signature [198 B] (HowTos)