Hello Matthias, if I install plasma-discover 5.12.4-2 with qml-module-qtquick-dialogs on a installation where I have only set "de_AT.UTF-8" as locale, discover does not work.
In this situation discover starts with the German GUI, but there is only a popup shown which says "Too few items to process", and no Applications are displayed. If I then execute a "sudo dpkg-reconfigure locales", add "en_US.UTF-8" (without changing the "Default locale for the system environment:") and restart the system, discover starts to work. Here is the output from the terminal from the the error situation: ==================== vbox@vbox-pc:~$ plasma-discover setting currentApplicationBackend PackageKitBackend(0x563238845790) could not find "org.kde.krita.desktop" "krita.desktop" could not find "org.kde.digikam.desktop" "digikam.desktop" could not find "org.kde.kdenlive.desktop" "" could not find "org.kde.ktorrent.desktop" "ktorrent.desktop" could not find "org.kde.gcompris.desktop" "gcompris.desktop" could not find "org.kde.kmymoney.desktop" "kmymoney.desktop" could not find "org.kde.kolourpaint.desktop" "kolourpaint.desktop" could not find "blender.desktop" "" could not find "inkscape.desktop" "" could not find "org.kde.development" "" could not find "org.kde.krita.desktop" "krita.desktop" could not find "org.kde.digikam.desktop" "digikam.desktop" could not find "org.kde.kdenlive.desktop" "" could not find "org.kde.ktorrent.desktop" "ktorrent.desktop" could not find "org.kde.gcompris.desktop" "gcompris.desktop" could not find "org.kde.kmymoney.desktop" "kmymoney.desktop" could not find "org.kde.kolourpaint.desktop" "kolourpaint.desktop" could not find "blender.desktop" "" could not find "inkscape.desktop" "" could not find "org.kde.development" "" trying to load "/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/file.so" from "/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/file.so" failed PackageKit::Transaction::Exit(ExitUnknown) PackageKit::Transaction(0x5632386cd940) Transaction error: "Too few items to process" PackageKit::Transaction(0x5632386cd940) qml: message: Too few items to process failed PackageKit::Transaction::Exit(ExitFailed) PackageKit::Transaction(0x5632386cd940) failed PackageKit::Transaction::Exit(ExitUnknown) PackageKit::Transaction(0x5632386cdce0) Transaction error: "Too few items to process" PackageKit::Transaction(0x5632386cdce0) qml: message: Too few items to process failed PackageKit::Transaction::Exit(ExitFailed) PackageKit::Transaction(0x5632386cdce0) trying to load "/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/http.so" from "/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/http.so" could not find "org.kde.krita.desktop" "krita.desktop" could not find "org.kde.digikam.desktop" "digikam.desktop" could not find "org.kde.kdenlive.desktop" "" could not find "org.kde.ktorrent.desktop" "ktorrent.desktop" could not find "org.kde.gcompris.desktop" "gcompris.desktop" could not find "org.kde.kmymoney.desktop" "kmymoney.desktop" could not find "org.kde.kolourpaint.desktop" "kolourpaint.desktop" could not find "blender.desktop" "" could not find "inkscape.desktop" "" could not find "org.kde.development" "" kf5.kio.kio_http: Can't communicate with kded_kcookiejar! could not find "org.kde.krita.desktop" "krita.desktop" could not find "org.kde.digikam.desktop" "digikam.desktop" could not find "org.kde.kdenlive.desktop" "" could not find "org.kde.ktorrent.desktop" "ktorrent.desktop" could not find "org.kde.gcompris.desktop" "gcompris.desktop" could not find "org.kde.kmymoney.desktop" "kmymoney.desktop" could not find "org.kde.kolourpaint.desktop" "kolourpaint.desktop" could not find "blender.desktop" "" could not find "inkscape.desktop" "" could not find "org.kde.development" "" Regards, Robert