The error is:

DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
ERROR got error from PostInstallScript ./xorg_fix_proprietary.py 
(g-exec-error-quark: L'exécution du processus fils « ./xorg_fix_proprietary.py 
» a échoué (Aucun fichier ou dossier de ce type) (8))

So the installed nvidia driver introduce that issue.
Purge nvidia (sudo apt-get purge nvidia*) and reboot (nouveau will be used).
downgrade to genuine package(s) if other ppa's package(s) exist.
Clean the system with 'gtkorphan' & 'bleachbit' (as root, carefully select the 
options).

Then dist-upgrade should be happier.

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

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https://bugs.launchpad.net/bugs/1768028

Title:
  cannot upgrade to 18.04 from 17.10

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