No se ha podido calcular la actualización

[Gustavo Berman]

Got a 7.04 ubuntu, and its up to date.
downloaded 7.10 alternative.
mounted it on /mnt
and executed: gksu "sh /mnt/cdromupgrade"
i do de proccess without network updates
it starts the process, and the this message appears:
"No se ha podido calcular la actualización
Ha ocurrido un problema irresoluble mientras se calculaba la actualización.
Por favor, notifique este fallo sobre el paquete «update-manager» e incluya los archivos de /var/log/dist-upgrade/ en el informe."

[Gustavo Berman (gustavoberman)]

term.log is empty

[Gustavo Berman (gustavoberman)]

if I execute: gksu "sh /mnt/cdromupgrade"
and do the proccess WITH network updates
it updates to 7.10 with no problem.

PD: I don't think this is a duplicated bug of #134858 because it never crashed in my computer. It's just failed dependencies.