SUMMARY I have KDE Neon 16.04. Once I started upgrader, but changed my mind and at last question before the whole action I answered "No". Then I had dependency problems in packages. STEPS TO REPRODUCE 1. Launch "do-release-upgrade" 2. On the last question before the whole action answer "No" 3. Launch "sudo apt update && sudo apt full-upgrade" OBSERVED RESULT Starting pkgProblemResolver with broken count: 1 Starting 2 pkgProblemResolver with broken count: 1 Investigating (0) python3-aptdaemon.gtk3widgets [ amd64 ] < 1.1.1+bzr982+p16.04+git20171121.0035 -> 1.1.1+bzr982-0ubuntu14 | 1.1.1+bzr982+p16.04+git20171121.0035 > ( python ) Broken python3-aptdaemon.gtk3widgets:amd64 Depends on python3-aptdaemon [ amd64 ] < 1.1.1+bzr982+p16.04+git20171121.0035 > ( python ) (= 1.1.1+bzr982-0ubuntu14) Considering python3-aptdaemon:amd64 0 as a solution to python3-aptdaemon.gtk3widgets:amd64 0 Holding Back python3-aptdaemon.gtk3widgets:amd64 rather than change python3-aptdaemon:amd64 Try to Re-Instate (1) python3-aptdaemon.gtk3widgets:amd64 Done EXPECTED RESULT No problems. ADDITIONAL INFORMATION I solved this problem, commenting the following line in the "sources.list": "deb http://de.archive.ubuntu.com/ubuntu xenial main restricted multiverse universe". One of conflicting versions of package belongs to "http://archive.ubuntu.com/ubuntu xenial/main" I think, this was added there after I canceled Release Upgrader.
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I have tested with fresh Kubuntu 20.04, upgrading it to 22.04. No problem anymore.