Comment 3 for bug 1332550

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Daniel Manrique (roadmr) wrote :

Another comment, checkbox-gtk is not installed in new versions of Ubuntu, so the problem here is that it's been carried in the installation since the initial system was installed with 11.10, which did ship checkbox-gtk.

A workaround for your problem would be manually removing checkbox-gtk (sudo apt-get purge checkbox-gtk), then trying the release upgrade again.