You have plenty of broken packages: downgrade to genuine version via ppa-purge,
clean the system via 'gtkorphan' & bleachbit (as root, carefully select
options) and reboot.
Then dist-upgrade should be easier
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1769465
Title:
Can't upgrade to 18.04LTS
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