Use ppa-purge with each ppa installed, to downgrade to genuine version. Then 
clean the system via 'gtkorphan' & 'bleachbit' (as root, carefully select 
options) and reboot.
Next the upgrade script should be happier.

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

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https://bugs.launchpad.net/bugs/1770882

Title:
  could not upgrade to ubuntu 18.04

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