Error while upgrading from 12.04 LTS to 12.10 [closed]

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http://askubuntu.com РI'm trying to upgrade one of my servers from Ubuntu 12.04 LTS to 12.10 using the following commands. First I edit /etc/update-manager/release-upgrades and change Prompt=lts to Prompt=normal. Then I start the upgrade with do-release-upgrade -d The upgrade starts but fails immediately with the following output. I've already googled for this problem but didn't find any information. root@av1 ~ # do-release-upgrade -d Neue Veröffentlichungen von Ubuntu werden gesucht Hole:1 Signatur der Aktualisierungsanwendung [198 B] (HowTos)