The upgrade is failing to calculate because you have installed sane
packages from a PPA and the version of those packages are greater than
the ones in the release to which you are trying to upgrade. You'll need
to use the ppa-purge package to remove the packages from that PPA and
install the official versions of those packages, after that please
attempt the upgrade again.

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

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https://bugs.launchpad.net/bugs/1897695

Title:
  impossible d'évaluer la mise à niveau

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