[Bug 1931030] [NEW] Unable to upgrade to 21.04 from Kubuntu 20.10

[JORGETECH]

Public bug reported:

I tried removing the kubuntu-backports PPA and some other third-party
stuff I had installed but the problem still persists, apt complains
about some packages, most of them are KDE related ones.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubuntu-release-upgrader-core 1:20.10.16
ProcVersionSignature: Ubuntu 5.8.0-55.62-generic 5.8.18
Uname: Linux 5.8.0-55-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.7
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Sun Jun  6 18:49:06 2021
InstallationDate: Installed on 2018-09-30 (980 days ago)
InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Beta amd64 (20180927)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to groovy on 2021-06-06 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade groovy third-party-packages

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https://bugs.launchpad.net/bugs/1931030

Title:
  Unable to upgrade to 21.04 from Kubuntu 20.10

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I tried removing the kubuntu-backports PPA and some other third-party
  stuff I had installed but the problem still persists, apt complains
  about some packages, most of them are KDE related ones.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: ubuntu-release-upgrader-core 1:20.10.16
  ProcVersionSignature: Ubuntu 5.8.0-55.62-generic 5.8.18
  Uname: Linux 5.8.0-55-generic x86_64
  ApportVersion: 2.20.11-0ubuntu50.7
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Sun Jun  6 18:49:06 2021
  InstallationDate: Installed on 2018-09-30 (980 days ago)
  InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Beta amd64 (20180927)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to groovy on 2021-06-06 (0 days ago)
  VarLogDistupgradeTermlog:

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