Proposing:
- downgrade the ppa's packages to genuine version
- set your sources.list to genuine ones
- clean the system via 'gtkorphan' & 'bleachbit' (as root, select options
carefully)
- reboot and try dis-upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1768035
Title:
Upgrade to 18.04 from 17.10 fails
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