The postgres repository you have enabled is causing a failure to
calculate the upgrade.  You'll need to install the ppa-purge tool and
use it remove that repository and downgrade the packages to the official
Ubuntu versions for the upgrade to be calculated correctly.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1625103

Title:
  Unable to update ubuntu from 14.04 to 16.04, "No se ha podido calcular
  la actualización"

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