The upgrade failed to calculate because every entry in your
/etc/apt/sources.list file has been commented out. In order for the
upgrae to proceed you'll need to ensure your /etc/apt/sources.list file
contains valid mirrors. One way to do this may be to use the application
software-properties to choose a mirror of the Ubuntu archive near you.
Thanks and good luck.

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

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https://bugs.launchpad.net/bugs/1898562

Title:
  Si è verificato un problema irresolubile durante il calcolo
  dell'avanzamento.

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