The upgrader does not support unknow version from third party (ppa
packages are logged as broken).

Use 'ppa-purge' for each ppa, to downgrade to genuine ubuntu version, then 
check none of these ppas are active.
Next step is to clean the system via 'gtkorphan' & 'bleachbit' (as root, 
carefully select options)

After rebooting the dist-upgrade script should be happier.

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

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https://bugs.launchpad.net/bugs/1770504

Title:
  Error

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