I attempted to upgrade to kde neon 20.04.
The upgrade process failed due to problems downloading http://archive.neon.kde.org/user/pool/m ... amd64.ddeb

Afterwards Discover and the apt-get -s dist-upgrade were reporting broken packages (bubblewrap iio-sensor-proxy libepub0). Apt suggests to solve the situation by removing the following packages - accepting this seems like a bad idea:

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flatpak libflatpak0 plasma-discover-backend-flatpak

This is the output of apt-get -s dist-upgrade (sorry cant get this in English even if all locales variables are set to en_US.utf8):

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Paketlisten werden gelesen... Fertig
Abhängigkeitsbaum wird aufgebaut.       
Statusinformationen werden eingelesen.... Fertig
Starting pkgProblemResolver with broken count: 210%
Starting 2 pkgProblemResolver with broken count: 2
Investigating (0) flatpak:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mK NPb Ib >
Broken flatpak:amd64 Hängt ab von on bubblewrap:amd64 < 0.4.0-2+18.04+bionic+build1 -> 0.2.1-1ubuntu0.1 @ii mD > (>= 0.4.0)
  Considering bubblewrap:amd64 8 as a solution to flatpak:amd64 2
  Removing flatpak:amd64 rather than change bubblewrap:amd64
Investigating (0) libflatpak0:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mK Ib >
Broken libflatpak0:amd64 Hängt ab von on bubblewrap:amd64 < 0.4.0-2+18.04+bionic+build1 -> 0.2.1-1ubuntu0.1 @ii mD > (>= 0.4.0)
  Considering bubblewrap:amd64 8 as a solution to libflatpak0:amd64 2
  Removing libflatpak0:amd64 rather than change bubblewrap:amd64
Investigating (1) plasma-discover-backend-flatpak:amd64 < 5.19.4-0xneon+18.04+bionic+build79 @ii mK Ib >
Broken plasma-discover-backend-flatpak:amd64 Hängt ab von on flatpak:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mR NPb >
  Considering flatpak:amd64 2 as a solution to plasma-discover-backend-flatpak:amd64 5
  Added flatpak:amd64 to the remove list
Broken plasma-discover-backend-flatpak:amd64 Hängt ab von on libflatpak0:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mR > (>= 1.6.2)
  Considering libflatpak0:amd64 2 as a solution to plasma-discover-backend-flatpak:amd64 5
  Added libflatpak0:amd64 to the remove list
  Fixing plasma-discover-backend-flatpak:amd64 via keep of flatpak:amd64
  Fixing plasma-discover-backend-flatpak:amd64 via keep of libflatpak0:amd64
Investigating (1) flatpak:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mK NPb Ib >
Broken flatpak:amd64 Hängt ab von on bubblewrap:amd64 < 0.4.0-2+18.04+bionic+build1 -> 0.2.1-1ubuntu0.1 @ii mD > (>= 0.4.0)
  Considering bubblewrap:amd64 8 as a solution to flatpak:amd64 2
  Removing flatpak:amd64 rather than change bubblewrap:amd64
Investigating (1) libflatpak0:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mK Ib >
Broken libflatpak0:amd64 Hängt ab von on bubblewrap:amd64 < 0.4.0-2+18.04+bionic+build1 -> 0.2.1-1ubuntu0.1 @ii mD > (>= 0.4.0)
  Considering bubblewrap:amd64 8 as a solution to libflatpak0:amd64 2
  Removing libflatpak0:amd64 rather than change bubblewrap:amd64
Investigating (2) plasma-discover-backend-flatpak:amd64 < 5.19.4-0xneon+18.04+bionic+build79 @ii mK Ib >
Broken plasma-discover-backend-flatpak:amd64 Hängt ab von on flatpak:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mR NPb >
  Considering flatpak:amd64 2 as a solution to plasma-discover-backend-flatpak:amd64 5
  Added flatpak:amd64 to the remove list
Broken plasma-discover-backend-flatpak:amd64 Hängt ab von on libflatpak0:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mR > (>= 1.6.2)
  Considering libflatpak0:amd64 2 as a solution to plasma-discover-backend-flatpak:amd64 5
  Added libflatpak0:amd64 to the remove list
  Fixing plasma-discover-backend-flatpak:amd64 via keep of flatpak:amd64
  Fixing plasma-discover-backend-flatpak:amd64 via keep of libflatpak0:amd64
Investigating (2) flatpak:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mK NPb Ib >
Broken flatpak:amd64 Hängt ab von on bubblewrap:amd64 < 0.4.0-2+18.04+bionic+build1 -> 0.2.1-1ubuntu0.1 @ii mD > (>= 0.4.0)
  Considering bubblewrap:amd64 8 as a solution to flatpak:amd64 5
  Removing flatpak:amd64 rather than change bubblewrap:amd64
Investigating (2) libflatpak0:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mK Ib >
Broken libflatpak0:amd64 Hängt ab von on bubblewrap:amd64 < 0.4.0-2+18.04+bionic+build1 -> 0.2.1-1ubuntu0.1 @ii mD > (>= 0.4.0)
  Considering bubblewrap:amd64 8 as a solution to libflatpak0:amd64 5
  Removing libflatpak0:amd64 rather than change bubblewrap:amd64
Investigating (3) plasma-discover-backend-flatpak:amd64 < 5.19.4-0xneon+18.04+bionic+build79 @ii mK Ib >
Broken plasma-discover-backend-flatpak:amd64 Hängt ab von on flatpak:amd64 < 1.6.2-1+18.04+bionic+build5 @ii mR NPb >
  Considering flatpak:amd64 8 as a solution to plasma-discover-backend-flatpak:amd64 5
  Removing plasma-discover-backend-flatpak:amd64 rather than change flatpak:amd64
Done
Paketaktualisierung (Upgrade) wird berechnet... Fertig
Die folgenden Pakete wurden automatisch installiert und werden nicht mehr benötigt:
  libappstream-glib8 libllvm9 libllvm9:i386 libostree-1-1 linux-headers-5.3.0-59 linux-headers-5.3.0-59-generic linux-headers-5.3.0-61 linux-headers-5.3.0-61-generic linux-image-5.3.0-59-generic
  linux-image-5.3.0-61-generic linux-modules-5.3.0-59-generic linux-modules-5.3.0-61-generic linux-modules-extra-5.3.0-59-generic linux-modules-extra-5.3.0-61-generic linux-tools-4.15.0-108
  linux-tools-4.15.0-108-generic linux-tools-4.15.0-109 linux-tools-4.15.0-109-generic linux-tools-4.15.0-111 linux-tools-4.15.0-111-generic nextcloud-client nextcloud-client-dolphin nextcloud-client-l10n
  riot-desktop xdg-dbus-proxy xdg-desktop-portal-gtk
Verwenden Sie »sudo apt autoremove«, um sie zu entfernen.
Die folgenden Pakete werden ENTFERNT:
  flatpak libflatpak0 plasma-discover-backend-flatpak
Die folgenden Pakete werden durch eine ÄLTERE VERSION ERSETZT (Downgrade):
  bubblewrap iio-sensor-proxy libepub0
0 aktualisiert, 0 neu installiert, 3 durch eine ältere Version ersetzt, 3 zu entfernen und 0 nicht aktualisiert.
Remv plasma-discover-backend-flatpak [5.19.4-0xneon+18.04+bionic+build79]
Remv flatpak [1.6.2-1+18.04+bionic+build5]
Remv libflatpak0 [1.6.2-1+18.04+bionic+build5]
Inst bubblewrap [0.4.0-2+18.04+bionic+build1] (0.2.1-1ubuntu0.1 Ubuntu:18.04/bionic-updates, Ubuntu:18.04/bionic-security [amd64])
Inst iio-sensor-proxy [2.8+p18.04+git20200508.0025-0] (2.4-2 Ubuntu:18.04/bionic [amd64])
Inst libepub0 [0.2.2-4+18.04+bionic+build3] (0.2.2-4ubuntu1 Ubuntu:18.04/bionic [amd64])
Conf bubblewrap (0.2.1-1ubuntu0.1 Ubuntu:18.04/bionic-updates, Ubuntu:18.04/bionic-security [amd64])
Conf iio-sensor-proxy (2.4-2 Ubuntu:18.04/bionic [amd64])
Conf libepub0 (0.2.2-4ubuntu1 Ubuntu:18.04/bionic [amd64])


After some research in my system I found that the clean up after the failed upgrade to kde neon 2004 was apparently not complete.
There was an apt preferences file /etc/apt/preferences.d/98-focal-overrides which pins the broken packages named above to inappropriate versions. After removing /etc/apt/preferences.d/98-focal-overrides broken packages are no longer reported.

The solution suggested by apt in this case is quite dangerous as it might break installed flatpack applications if not worse.