Reviewing the files from your upgrade attempt you seem to have enabled
the oibaf PPA. This will prevent the upgrade as that PPA contains
different versions of packages essential to Ubuntu. Please revert to the
official Xorg packages and try the upgrade again.

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

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https://bugs.launchpad.net/bugs/1309615

Title:
  trying to upgrade to xubuntu 14.04. could not calculate upgrade

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