You seem to have a lot of packages on hold which is causing the release
upgrader to fail to calculate the upgrade.  The files on hold can be
seen in your VarLogDistupgradeAptlog file.

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

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https://bugs.launchpad.net/bugs/1593776

Title:
  cannot upgrade from 15.10 to 16.04

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