Dont be surprised to get such an issue:
- mixing Debian & Ubuntu: does not follow the same rules
- third parties packages: use ppa-purge to downgrade to genuine versions
- deactivate other ppas
- clean the system via gtkorphan & bleachbit (as root, carefully select options)
- run: sudo dpkg --configure -a
- reboot
Then dist-upgrading script should be happier.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1769446
Title:
upgrade to 18.04 LTS fail with "Hold prevents MarkGarbage of " errors
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