Comment 18 for bug 446956

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Michael Vogt (mvo) wrote : Re: Upgrade from Ubuntu UNR 9.04 to 9.10 fails with essential package 'ubuntu-minimal' can not be found anymore

Thanks for your bugreport and for the logs.

I suspect that the problem is that the mirrors are overloaded and that this is insufficiently captured from update-manager and that it presents a bogus error message. If that happens to you, could you please run in a terminal:
$ ls -R /var/lib/apt/lists > /tmp/lists.txt
and attach /tmp/lists.txt ?

Could you also please run "sudo apt-get update" afterwards and see it shows any errors or warnings?