could not calculate the upgrade

[Alan Pope]

On 12 October 2010 06:05, Tapas Mishra <mightydreams at gmail.com> wrote:
> The problem cannot be reported:
> This is not a genuine Ubuntu package
>

Which indicates you have tweaked your sources.list or installed an
update-manager package from elsewhere.

> What is 10.10 it feels it is useless to do any upgrades on 10.04 (this
> is a clean 10.04 installation without any experiment)
>

Based on previous mails I find this somewhat hard to believe.

What's the contents of /etc/apt/sources.list, and the contents of the
files in /etc/apt/sources.list.d/*

What's the output of the commands:-

dpkg -l update-manager
apt-cache show update-manager*

Al.