These instructions have been removed because we do not support distribution upgrades (and because by this point in time, any kind of upgrade to Ubuntu 9.10 is inadvisable).
We do not recommend upgrading a server to another distribution version if it's possible to migrate to a fresh install of that distribution on another server instead. Distribution upgrades aren't always reliable enough for a production environment.
If you do need to upgrade in place to a new Ubuntu version, we recommend checking the Ubuntu upgrade notes for your current Ubuntu version:
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