Fixed by removing proposed repository.
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https://bugs.launchpad.net/bugs/1891031
Title:
Error while upgrading from 18.04 to 20.04
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** Description changed:
- Complains about kubuntu-desktop and ubuntu-release-upgrader-qt
+ Complains about kubuntu-desktop and ubuntu-release-upgrader-qt.
+
+ I installed meta-package kubuntu-desktop right before upgrade.
+ Unfortunately I do not understand the output of apt.log.
+
+
