I'm trying to upgrade an old ubuntu server from 8.10 (Intrepid) to 9.04 (Jaunty). But it fails.

root@server1:/# do-release-upgrade
Checking for a new ubuntu release
Failed Upgrade tool signature
Failed Upgrade tool
Done downloading
extracting 'jaunty.tar.gz'
Failed to extract
Extracting the upgrade failed. There may be a problem with the network or with the server.

Does anyone have an idea why I get this error and how to fix it?

UPDATE: I think i might have tracked the problem down.

My /etc/update-manager/meta-release looks like this:

[METARELEASE]

URI = http://changelogs.ubuntu.com/meta-release
URI_LTS = http://changelogs.ubuntu.com/meta-release-lts
URI_UNSTABLE_POSTFIX = -development
URI_PROPOSED_POSTFIX = -proposed

If i go to http://changelogs.ubuntu.com/meta-release it has this info for Jaunty:

Dist: jaunty
Name: Jaunty Jackalope
Version: 9.04
Date: Thu, 23 Apr 2009 12:00:00 UTC
Supported: 0
Description: This is the 9.04 release
Release-File: http://archive.ubuntu.com/ubuntu/dists/jaunty/Release
ReleaseNotes: http://changelogs.ubuntu.com/EOLReleaseAnnouncement
UpgradeTool: http://archive.ubuntu.com/ubuntu/dists/jaunty-proposed/main/dist-upgrader-all/0.111.8/jaunty.tar.gz
UpgradeToolSignature: http://archive.ubuntu.com/ubuntu/dists/jaunty-proposed/main/dist-upgrader-all/0.111.8/jaunty.tar.gz.gpg

Those links starting with archive.ubuntu.com are broken since jaunty is EOL.

I guess i could fix this by copying this file, replacing "archive" with "old-releases", host the modified file somewhere and change the url in the meta-release file. Is this a good solution or will it make me run into worse problems?