Comment 2 for bug 1860606

Same here. Ran "pkexec do-release-upgrade -m desktop -f DistUpgradeViewKDE" and this crashed after a short time, with the above exception in /var/log/dist-upgrade

Annoyingly, the tool had already made sufficient changes (to the sources.dist?), so re-running the upgrade, even from the command line (sudo do-release-upgrade -m desktop) resulted in an error saying I had packages to upgrade. Which of course I did, thousands of them.

I ran apt full-upgrade and now I can run "sudo do-release-upgrade -m desktop". But it only says no upgrades found. So I have no idea whether any further action needs to be taken or not.

How can I resume the upgrade, or manually do whatever clean ups are necessary now that the packages are upgraded???