A week ago, i ran Discover software center , it was stalled in the middle.
After a while i closed it, and opened again, it said 'Up to date'.
Since then every time i started Discover, it says 'Up to date'.
Tried to open it in the command line, here is the output:
$ plasma-discover
qrc:/qml/Feedback.qml:2:1: module "org.kde.userfeedback" is not installed
adding empty sources model QStandardItemModel(0x55603ec1a7c0)
invalid kns backend! "/usr/share/knsrcfiles/ksysguard.knsrc" because: "Config group not found! Check your KNS3 installation."
org.kde.plasma.libdiscover: Couldn't find a category for "fwupd-backend"
remote hasn't changed: lvfs
org.kde.knewstuff.core: "Error transferring https://distribute.kde.org/khotnewstuff/fonts-providers.xml - server replied: Not Found"
KNS error in "Fonts" : KNSCore::ProviderError "Loading of providers from file: https://distribute.kde.org/khotnewstuff/fonts-providers.xml failed" QVariant(QString, "https://distribute.kde.org/khotnewstuff/fonts-providers.xml")
invalid kns backend! "/usr/share/knsrcfiles/kfontinst.knsrc" because: "Invalid Fonts backend, contact your distributor."
org.kde.plasma.libdiscover: Discarding invalid backend "kfontinst.knsrc"
kns error "/usr/share/knsrcfiles/kfontinst.knsrc" "Invalid Fonts backend, contact your distributor."
org.kde.plasma.libdiscover: Couldn't find a category for "fwupd-backend"
took really long to fetch PackageKitBackend(0x55603eb42cb0)
took really long to fetch KNSBackend(0x55603efd4720, name = "/usr/share/knsrcfiles/discover_ktexteditor_codesnippets_core.knsrc")
took really long to fetch KNSBackend(0x55603f01b2d0, name = "/usr/share/knsrcfiles/colorschemes.knsrc")
took really long to fetch KNSBackend(0x55603f01b750, name = "/usr/share/knsrcfiles/kwinscripts.knsrc")
took really long to fetch KNSBackend(0x55603f01fda0, name = "/usr/share/knsrcfiles/aurorae.knsrc")
took really long to fetch KNSBackend(0x55603f020440, name = "/usr/share/knsrcfiles/lookandfeel.knsrc")
took really long to fetch KNSBackend(0x55603f035af0, name = "/usr/share/knsrcfiles/xcursor.knsrc")
took really long to fetch KNSBackend(0x55603f032180, name = "/usr/share/knsrcfiles/wallpaperplugin.knsrc")
took really long to fetch KNSBackend(0x55603f022480, name = "/usr/share/knsrcfiles/kwineffect.knsrc")
took really long to fetch KNSBackend(0x55603f0305a0, name = "/usr/share/knsrcfiles/kwinswitcher.knsrc")
took really long to fetch KNSBackend(0x55603f024b80, name = "/usr/share/knsrcfiles/konsole.knsrc")
took really long to fetch KNSBackend(0x55603f040270, name = "/usr/share/knsrcfiles/icons.knsrc")
took really long to fetch KNSBackend(0x55603f039a70, name = "/usr/share/knsrcfiles/gtk2_themes.knsrc")
took really long to fetch KNSBackend(0x55603f048e50, name = "/usr/share/knsrcfiles/gtk3_themes.knsrc")
took really long to fetch KNSBackend(0x55603f049f60, name = "/usr/share/knsrcfiles/comic.knsrc")
took really long to fetch KNSBackend(0x55603f054730, name = "/usr/share/knsrcfiles/sddmtheme.knsrc")
took really long to fetch KNSBackend(0x55603f04a530, name = "/usr/share/knsrcfiles/plasma-themes.knsrc")
took really long to fetch KNSBackend(0x55603f053e70, name = "/usr/share/knsrcfiles/wallpaper.knsrc")
took really long to fetch KNSBackend(0x55603f04ff00, name = "/usr/share/knsrcfiles/ksplash.knsrc")
took really long to fetch KNSBackend(0x55603f04e5a0, name = "/usr/share/knsrcfiles/window-decorations.knsrc")
file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kirigami.2/private/globaltoolbar/ToolBarPageHeader.qml:44:9: QML ActionToolBar: Binding loop detected for property "actions"
user@user-computer:~$ kdeinit5: PID 3343 terminated.
kdeinit5: PID 3335 terminated.
kdeinit5: PID 3344 terminated.
