This is because of the ubuntu-x-swat PPA you have enabled. Look for the
tool ppa-purge to deactivate the PPA and revert to the official package
versions in Ubuntu 12.04, then the upgrade should proceed.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1313815
Title:
upgrading from 12.04 LTS -> 14.04 LTS Could not calculate the upgrade
(maybe weird graphics stuff going on)
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