Comment 2 for bug 1769446

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.