Kubuntu 8.10 failed to upgrade to 9.04

[Franspot]

Binary package hint: update-manager

There is an error when I try to upgrade kubuntu from 8.10 to 9.04. The screen says:
"An unresolvable problem occurred while calculating the upgrade: E: No se pudieron corregir los problemas, usted ah retenido paquetes rotos. This can be caused by:* Upgrading to a pre-release version Ubuntu * Running the current pre-release version of Ubuntu * Unofficial software packages not provided by Ubuntu.

I already did
sudo dpkg --configure -a
and restart the computer as it says in the Kubuntu web page, but It did not work

I'm including the /var/log/dist-upgrade/20090523/main.log

I'm not an expert and I don't really know If I'm sending the right files.
If you need more information just ask me, I will be glad to help.

[Pedro Villavicencio (pedro)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please add all the files contained in /var/log/dist-upgrade/ to your bug report as separate attachments? Thanks in advance.

[Franspot (f-spotorno)]

term file is empty

[Franspot (f-spotorno)]

The term.log file is empty

[Franspot (f-spotorno)]

Here, there are all the files /var/log/dist-upgrade But, all the term.log files are empty. The first main.log file that I upload It's old. So I suggest to to use all the other files