Comment 5 for bug 1924951

The error that you encountered was with calculating the upgrade, which only changes your /etc/apt/sources.list file from your old release to the new one and then calculates the upgrade. To test the fix it would be enough to just run the upgrade process to the point where it asks you if you want to upgrade and then quit the process. That being said I've enough positive feedback so far to feel confident that the change works so do whatever you feel comfortable with.