could not calculate the upgrade

[Tapas Mishra]

On Mon, Oct 11, 2010 at 3:41 PM, Tapas Mishra <mightydreams at gmail.com> wrote:
> I was updating from 10.04 to 10.10 (was updating through update manager))
> after some time I got following message
>
> An unresolvable problem occurred while calculating the upgrade:
> E:Unable to correct problems, you have held broken packages.
>
>  This can be caused by:
>  * Upgrading to a pre-release version of Ubuntu
>  * Running the current pre-release version of Ubuntu
>  * Unofficial software packages not provided by Ubuntu
>
> If none of this applies, then please report this bug against the
> 'update-manager' package and include the files in
> /var/log/dist-upgrade/ in the bug report.
>
>
> What do I need to do now?
>

Hi,
list I have solved this issue
sudo apt-get install ppa-purge
And to purge the xorg-edgers packages:
sudo ppa-purge xorg-edgers
after this update went perfectly fine.
this is how this problem was over come