I don't know, if it important or not, but it looks like errors: invalid kns backend! "/etc/xdg/ksysguard.knsrc" because: "Config group not found! Check your KNS3 installation." invalid kns backend! "/etc/xdg/servicemenu.knsrc" because: "Config group not found! Check your KNS3 installation." Discarding invalid backend "ksysguard.knsrc" Discarding invalid backend "servicemenu.knsrc" setting currentApplicationBackend PackageKitBackend(0x24be0b0) org.kde.knewstuff.core: Could not find category "KAddressbook Theme" invalid kns backend! "/etc/xdg/kaddressbook_themes.knsrc" because: "All categories are missing" Discarding invalid backend "kaddressbook_themes.knsrc" qrc:/qml/DiscoverDrawer.qml:155: TypeError: Cannot read property 'name' of null qrc:/qml/DiscoverDrawer.qml:155: TypeError: Cannot read property 'name' of null kns error "/etc/xdg/kaddressbook_themes.knsrc" "Invalid Kaddressbook_themes backend, contact your distributor." org.kde.knewstuff.core: Could not find category "Calligra Flow Stencil" invalid kns backend! "/etc/xdg/calligra_stencils.knsrc" because: "All categories are missing" Discarding invalid backend "calligra_stencils.knsrc" qrc:/qml/DiscoverDrawer.qml:155: TypeError: Cannot read property 'name' of null qrc:/qml/DiscoverDrawer.qml:155: TypeError: Cannot read property 'name' of null qrc:/qml/DiscoverDrawer.qml:155: TypeError: Cannot read property 'name' of null qrc:/qml/DiscoverDrawer.qml:155: TypeError: Cannot read property 'name' of null kns error "/etc/xdg/calligra_stencils.knsrc" "Invalid Calligra_stencils backend, contact your distributor." org.kde.knewstuff.core: Could not find category "Xfce Icon Theme" invalid kns backend! "/etc/xdg/cgcicon.knsrc" because: "All categories are missing" Discarding invalid backend "cgcicon.knsrc" kns error "/etc/xdg/cgcicon.knsrc" "Invalid Icon Themes backend, contact your distributor."
Very related to that bug. Feel free to report to the separate projects (ksysguard, servicemenu, kaddressbook, calligra) if you think the knsrc file is still maintained. *** This bug has been marked as a duplicate of bug 395718 ***