Public bug reported:

The updater fails, warns about third party PPAs. I have disabled all
third party PPAs in package sources, but no luck, same error. It says I
should use ppa-purge to remove third party launchpad ppa.

main.log says "Dist-upgrade failed: 'Das Paket »update-manager-core« ist
zum Löschen vorgesehen, wurde aber durch das System gesperrt.'"

"The package update-manager-core is marked for deletion, but has been
locked by the system".

It seems to me that it tries to uninstall update-manager-core, but
can't, because it is on the blacklist. Makes no sense to me, why should
the update-manager uninstall itself during the update?

1)
Description:    Ubuntu 19.04
Release:        19.04

2)
ubuntu-release-upgrader-core:
  Installiert:           1:19.04.16.7
 
3) expected upgrader to upgrade my installation to 19.10 Eoan Ermine

4) Updater fails, logfiles attached

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: ubuntu-release-upgrader-core 1:19.04.16.7
ProcVersionSignature: Ubuntu 5.0.0-32.34-generic 5.0.21
Uname: Linux 5.0.0-32-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Fri Oct 25 20:45:51 2019
InstallationDate: Installed on 2018-04-30 (542 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to disco on 2019-10-25 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco dist-upgrade

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https://bugs.launchpad.net/bugs/1849885

Title:
  Upgrade Kubuntu 19.04 -> 19.10 fails

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