You have too much installed ppas:
- downgrade via 'ppa-purge', then clean the system with 'gtkorphan' &
'bleachbit' (as root, carefully select options)
- deactivate the other ppas and reboot
- try again to upgrade
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1770226
Title:
Update from 17.10 to 18.04 fail
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