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I'm having this problem since the KDE update, addons for system settings don't load:
kf.coreaddons: "Could not load plugin from kcm_kscreen: The shared library was not found."
Addons are present in `/usr/lib/qt/plugins/kcms`. This break some KDE functionality. It happens on a fresh user. I reported the problem to KDE devs but it's been closed as a downstream issue ( https://bugs.kde.org/show_bug.cgi?id=455648 ). I have some doubts, what do you guys think?
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kscreen is installed?
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Of course it is installed. The plugin is present in `/usr/lib/qt/plugins/kcms`. The same happen with kcm_pulseaudio. That folder contains:
total 288K
-rwxr-xr-x 1 root root 31K jun 10 21:36 kcm_kaccounts.so
-rwxr-xr-x 1 root root 215K jun 21 10:46 kcm_kscreen.so
-rwxr-xr-x 1 root root 39K jun 21 10:48 kcm_pulseaudio.so
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Then you have some partial upgrade, or a broken theme. qt5 was recently updated make sure you got all of that. In doubt post
lddtree /usr/lib/qt/plugins/kcms/kcm_kscreen.so
lddtree you can get from pax-utils.
Is this the only fallout? do Qt tools in general work?
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Output from lddtree:
/usr/lib/qt/plugins/kcms/kcm_kscreen.so (interpreter => None)
libKF5PlasmaQuick.so.5 => /usr/lib/libKF5PlasmaQuick.so.5
libKF5Plasma.so.5 => /usr/lib/libKF5Plasma.so.5
libQt5Sql.so.5 => /usr/lib/libQt5Sql.so.5
libKF5XmlGui.so.5 => /usr/lib/libKF5XmlGui.so.5
libQt5Network.so.5 => /usr/lib/libQt5Network.so.5
libz.so.1 => /usr/lib/libz.so.1
libgssapi_krb5.so.2 => /usr/lib/libgssapi_krb5.so.2
libkrb5.so.3 => /usr/lib/libkrb5.so.3
libk5crypto.so.3 => /usr/lib/libk5crypto.so.3
libcom_err.so.2 => /usr/lib/libcom_err.so.2
ld-linux-x86-64.so.2 => /usr/lib/ld-linux-x86-64.so.2
libkrb5support.so.0 => /usr/lib/libkrb5support.so.0
libkeyutils.so.1 => /usr/lib/libkeyutils.so.1
libresolv.so.2 => /usr/lib/libresolv.so.2
libssl.so.1.1 => /usr/lib/libssl.so.1.1
libcrypto.so.1.1 => /usr/lib/libcrypto.so.1.1
libQt5PrintSupport.so.5 => /usr/lib/libQt5PrintSupport.so.5
libQt5Xml.so.5 => /usr/lib/libQt5Xml.so.5
libKF5WidgetsAddons.so.5 => /usr/lib/libKF5WidgetsAddons.so.5
libKF5ItemViews.so.5 => /usr/lib/libKF5ItemViews.so.5
libKF5GlobalAccel.so.5 => /usr/lib/libKF5GlobalAccel.so.5
libKF5Notifications.so.5 => /usr/lib/libKF5Notifications.so.5
libcanberra.so.0 => /usr/lib/libcanberra.so.0
libvorbisfile.so.3 => /usr/lib/libvorbisfile.so.3
libvorbis.so.0 => /usr/lib/libvorbis.so.0
libogg.so.0 => /usr/lib/libogg.so.0
libtdb.so.1 => /usr/lib/libtdb.so.1
libltdl.so.7 => /usr/lib/libltdl.so.7
libQt5TextToSpeech.so.5 => /usr/lib/libQt5TextToSpeech.so.5
libX11.so.6 => /usr/lib/libX11.so.6
libXtst.so.6 => /usr/lib/libXtst.so.6
libXext.so.6 => /usr/lib/libXext.so.6
libdbusmenu-qt5.so.2 => /usr/lib/libdbusmenu-qt5.so.2
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1
libKF5KIOWidgets.so.5 => /usr/lib/libKF5KIOWidgets.so.5
libKF5KIOCore.so.5 => /usr/lib/libKF5KIOCore.so.5
libKF5Crash.so.5 => /usr/lib/libKF5Crash.so.5
libKF5AuthCore.so.5 => /usr/lib/libKF5AuthCore.so.5
libacl.so.1 => /usr/lib/libacl.so.1
libmount.so.1 => /usr/lib/libmount.so.1
libblkid.so.1 => /usr/lib/libblkid.so.1
libKF5JobWidgets.so.5 => /usr/lib/libKF5JobWidgets.so.5
libKF5Solid.so.5 => /usr/lib/libKF5Solid.so.5
libudev.so.1 => /usr/lib/libudev.so.1
libimobiledevice-1.0.so.6 => /usr/lib/libimobiledevice-1.0.so.6
libgnutls.so.30 => /usr/lib/libgnutls.so.30
libp11-kit.so.0 => /usr/lib/libp11-kit.so.0
libffi.so.8 => /usr/lib/libffi.so.8
libdl.so.2 => /usr/lib/libdl.so.2
libbrotlienc.so.1 => /usr/lib/libbrotlienc.so.1
libbrotlicommon.so.1 => /usr/lib/libbrotlicommon.so.1
libbrotlidec.so.1 => /usr/lib/libbrotlidec.so.1
libzstd.so.1 => /usr/lib/libzstd.so.1
libidn2.so.0 => /usr/lib/libidn2.so.0
libunistring.so.2 => /usr/lib/libunistring.so.2
libnettle.so.8 => /usr/lib/libnettle.so.8
libhogweed.so.6 => /usr/lib/libhogweed.so.6
libgmp.so.10 => /usr/lib/libgmp.so.10
libtasn1.so.6 => /usr/lib/libtasn1.so.6
libgcrypt.so.20 => /usr/lib/libgcrypt.so.20
libgpg-error.so.0 => /usr/lib/libgpg-error.so.0
libusbmuxd-2.0.so.6 => /usr/lib/libusbmuxd-2.0.so.6
libpthread.so.0 => /usr/lib/libpthread.so.0
libplist-2.0.so.3 => /usr/lib/libplist-2.0.so.3
libKF5Completion.so.5 => /usr/lib/libKF5Completion.so.5
libKF5KIOGui.so.5 => /usr/lib/libKF5KIOGui.so.5
libKF5Service.so.5 => /usr/lib/libKF5Service.so.5
libKF5DBusAddons.so.5 => /usr/lib/libKF5DBusAddons.so.5
libQt5Svg.so.5 => /usr/lib/libQt5Svg.so.5
libKF5Archive.so.5 => /usr/lib/libKF5Archive.so.5
libbz2.so.1.0 => /usr/lib/libbz2.so.1.0
liblzma.so.5 => /usr/lib/liblzma.so.5
libKF5ConfigWidgets.so.5 => /usr/lib/libKF5ConfigWidgets.so.5
libKF5Codecs.so.5 => /usr/lib/libKF5Codecs.so.5
libKF5GuiAddons.so.5 => /usr/lib/libKF5GuiAddons.so.5
libQt5WaylandClient.so.5 => /usr/lib/libQt5WaylandClient.so.5
libwayland-cursor.so.0 => /usr/lib/libwayland-cursor.so.0
libfontconfig.so.1 => /usr/lib/libfontconfig.so.1
libexpat.so.1 => /usr/lib/libexpat.so.1
libfreetype.so.6 => /usr/lib/libfreetype.so.6
libpng16.so.16 => /usr/lib/libpng16.so.16
libharfbuzz.so.0 => /usr/lib/libharfbuzz.so.0
libfreetype.so.6 => !!! circular loop !!!
libgraphite2.so.3 => /usr/lib/libgraphite2.so.3
libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0
libpcre.so.1 => /usr/lib/libpcre.so.1
libxkbcommon.so.0 => /usr/lib/libxkbcommon.so.0
libwayland-client.so.0 => /usr/lib/libwayland-client.so.0
libQt5DBus.so.5 => /usr/lib/libQt5DBus.so.5
libdbus-1.so.3 => /usr/lib/libdbus-1.so.3
libsystemd.so.0 => /usr/lib/libsystemd.so.0
libcap.so.2 => /usr/lib/libcap.so.2
liblz4.so.1 => /usr/lib/liblz4.so.1
libQt5Widgets.so.5 => /usr/lib/libQt5Widgets.so.5
libKF5WaylandClient.so.5 => /usr/lib/libKF5WaylandClient.so.5
libxcb.so.1 => /usr/lib/libxcb.so.1
libXau.so.6 => /usr/lib/libXau.so.6
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6
libxcb-shape.so.0 => /usr/lib/libxcb-shape.so.0
libKF5Package.so.5 => /usr/lib/libKF5Package.so.5
libKF5IconThemes.so.5 => /usr/lib/libKF5IconThemes.so.5
libKF5WindowSystem.so.5 => /usr/lib/libKF5WindowSystem.so.5
libxcb-keysyms.so.1 => /usr/lib/libxcb-keysyms.so.1
libQt5X11Extras.so.5 => /usr/lib/libQt5X11Extras.so.5
libm.so.6 => /usr/lib/libm.so.6
libKF5QuickAddons.so.5 => /usr/lib/libKF5QuickAddons.so.5
libKF5Screen.so.7 => /usr/lib/libKF5Screen.so.7
libQt5Sensors.so.5 => /usr/lib/libQt5Sensors.so.5
libKF5Declarative.so.5 => /usr/lib/libKF5Declarative.so.5
libQt5Quick.so.5 => /usr/lib/libQt5Quick.so.5
libQt5QmlModels.so.5 => /usr/lib/libQt5QmlModels.so.5
libQt5Qml.so.5 => /usr/lib/libQt5Qml.so.5
libKF5ConfigGui.so.5 => /usr/lib/libKF5ConfigGui.so.5
libKF5ConfigCore.so.5 => /usr/lib/libKF5ConfigCore.so.5
libKF5I18n.so.5 => /usr/lib/libKF5I18n.so.5
libKF5CoreAddons.so.5 => /usr/lib/libKF5CoreAddons.so.5
libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5
libGL.so.1 => /usr/lib/libGL.so.1
libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0
libGLX.so.0 => /usr/lib/libGLX.so.0
libmd4c.so.0 => /usr/lib/libmd4c.so.0
libQt5Core.so.5 => /usr/lib/libQt5Core.so.5
libdouble-conversion.so.3 => /usr/lib/libdouble-conversion.so.3
libicui18n.so.71 => /usr/lib/libicui18n.so.71
libicuuc.so.71 => /usr/lib/libicuuc.so.71
libicudata.so.71 => /usr/lib/libicudata.so.71
libpcre2-16.so.0 => /usr/lib/libpcre2-16.so.0
libstdc++.so.6 => /usr/lib/libstdc++.so.6
libc.so.6 => /usr/lib/libc.so.6
The problem is present on multiple different machines.
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This break some KDE functionality.
What functionality? You might be misdiagnosing your issue.
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