As suggest:

-downgrade ppa's packages to genuine version
- un-pin 'unity' (The package 'unity' is marked for removal but it is in the 
removal blacklist)
-deactivate ppas

Then dist-upgrade script should be happier.

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

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https://bugs.launchpad.net/bugs/1768561

Title:
  Update to Ubuntu 18.04 LTS fails

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