No protocol specified
qt.qpa.xcb: could not connect to display :0
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/qt/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/KWinQpaPlugin.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/KWinQpaPlugin.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"wayland-org.kde.kwin.qpa"
]
},
"archreq": 0,
"className": "KWinIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("wayland-org.kde.kwin.qpa")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqeglfs.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqeglfs.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"eglfs"
]
},
"archreq": 0,
"className": "QEglFSIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqlinuxfb.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"linuxfb"
]
},
"archreq": 0,
"className": "QLinuxFbIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqminimal.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqminimal.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"minimal"
]
},
"archreq": 0,
"className": "QMinimalIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqminimalegl.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqminimalegl.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"minimalegl"
]
},
"archreq": 0,
"className": "QMinimalEglIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqoffscreen.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqoffscreen.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"offscreen"
]
},
"archreq": 0,
"className": "QOffscreenIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqvnc.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqvnc.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"vnc"
]
},
"archreq": 0,
"className": "QVncIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqwayland-egl.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqwayland-egl.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"wayland-egl"
]
},
"archreq": 0,
"className": "QWaylandEglPlatformIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("wayland-egl")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqwayland-generic.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqwayland-generic.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"wayland"
]
},
"archreq": 0,
"className": "QWaylandIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("wayland")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqwayland-xcomposite-egl.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"wayland-xcomposite-egl"
]
},
"archreq": 0,
"className": "QWaylandXCompositeEglPlatformIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("wayland-xcomposite-egl")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqwayland-xcomposite-glx.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"wayland-xcomposite-glx"
]
},
"archreq": 0,
"className": "QWaylandXCompositeGlxPlatformIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("wayland-xcomposite-glx")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqxcb.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqxcb.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"xcb"
]
},
"archreq": 0,
"className": "QXcbIntegrationPlugin",
"debug": false,
"version": 331264
}
Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/tom/Scripts/lcd-image-converter/release/linux/output/platforms" ...
loaded library "/usr/lib/qt/plugins/platforms/libqxcb.so"
No protocol specified
qt.qpa.xcb: could not connect to display :0
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.
Aborted (core dumped)
I'm not sure how much info is helpful to see what's wrong but here's the dump of dependencies for libqxcb on my system:
$ldd /usr/lib/qt/plugins/platforms/libqxcb.so
linux-vdso.so.1 (0x00007ffead998000)
libQt5XcbQpa.so.5 => /usr/lib/libQt5XcbQpa.so.5 (0x00007f8a613c8000)
libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007f8a60d20000)
libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007f8a607e8000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f8a605fe000)
libc.so.6 => /usr/lib/libc.so.6 (0x00007f8a60437000)
libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00007f8a603f0000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00007f8a60320000)
libQt5DBus.so.5 => /usr/lib/libQt5DBus.so.5 (0x00007f8a60285000)
libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f8a60263000)
libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0x00007f8a6025e000)
libxcb-xinput.so.0 => /usr/lib/libxcb-xinput.so.0 (0x00007f8a60239000)
libxcb-icccm.so.4 => /usr/lib/libxcb-icccm.so.4 (0x00007f8a60034000)
libxcb-image.so.0 => /usr/lib/libxcb-image.so.0 (0x00007f8a5fe2d000)
libxcb-shm.so.0 => /usr/lib/libxcb-shm.so.0 (0x00007f8a5fe28000)
libxcb-keysyms.so.1 => /usr/lib/libxcb-keysyms.so.1 (0x00007f8a5fc25000)
libxcb-randr.so.0 => /usr/lib/libxcb-randr.so.0 (0x00007f8a5fc13000)
libxcb-render-util.so.0 => /usr/lib/libxcb-render-util.so.0 (0x00007f8a5fa0f000)
libxcb-render.so.0 => /usr/lib/libxcb-render.so.0 (0x00007f8a5f9ff000)
libxcb-shape.so.0 => /usr/lib/libxcb-shape.so.0 (0x00007f8a5f9f7000)
libxcb-sync.so.1 => /usr/lib/libxcb-sync.so.1 (0x00007f8a5f9ed000)
libxcb-xfixes.so.0 => /usr/lib/libxcb-xfixes.so.0 (0x00007f8a5f9e3000)
libxcb-xinerama.so.0 => /usr/lib/libxcb-xinerama.so.0 (0x00007f8a5f9de000)
libxcb-xkb.so.1 => /usr/lib/libxcb-xkb.so.1 (0x00007f8a5f9c0000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007f8a5f996000)
libX11.so.6 => /usr/lib/libX11.so.6 (0x00007f8a5f854000)
libSM.so.6 => /usr/lib/libSM.so.6 (0x00007f8a5f849000)
libICE.so.6 => /usr/lib/libICE.so.6 (0x00007f8a5f82c000)
libxkbcommon-x11.so.0 => /usr/lib/libxkbcommon-x11.so.0 (0x00007f8a5f822000)
libxkbcommon.so.0 => /usr/lib/libxkbcommon.so.0 (0x00007f8a5f7e1000)
libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00007f8a5f6bc000)
libm.so.6 => /usr/lib/libm.so.6 (0x00007f8a5f574000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f8a5f55a000)
libmd4c.so.0 => /usr/lib/libmd4c.so.0 (0x00007f8a5f544000)
libGL.so.1 => /usr/lib/libGL.so.1 (0x00007f8a5f4be000)
libpng16.so.16 => /usr/lib/libpng16.so.16 (0x00007f8a5f486000)
libz.so.1 => /usr/lib/libz.so.1 (0x00007f8a5f46c000)
libharfbuzz.so.0 => /usr/lib/libharfbuzz.so.0 (0x00007f8a5f366000)
libsystemd.so.0 => /usr/lib/libsystemd.so.0 (0x00007f8a5f2bf000)
libdouble-conversion.so.3 => /usr/lib/libdouble-conversion.so.3 (0x00007f8a5f2a8000)
libicui18n.so.65 => /usr/lib/libicui18n.so.65 (0x00007f8a5efb4000)
libicuuc.so.65 => /usr/lib/libicuuc.so.65 (0x00007f8a5edd2000)
libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f8a5edcd000)
libpcre2-16.so.0 => /usr/lib/libpcre2-16.so.0 (0x00007f8a5ed47000)
libzstd.so.1 => /usr/lib/libzstd.so.1 (0x00007f8a5ec9d000)
/usr/lib64/ld-linux-x86-64.so.2 (0x00007f8a6156b000)
libexpat.so.1 => /usr/lib/libexpat.so.1 (0x00007f8a5ec6d000)
libuuid.so.1 => /usr/lib/libuuid.so.1 (0x00007f8a5ec64000)
libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0x00007f8a5ec51000)
libdbus-1.so.3 => /usr/lib/libdbus-1.so.3 (0x00007f8a5ec07000)
libXau.so.6 => /usr/lib/libXau.so.6 (0x00007f8a5ec00000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007f8a5ebf8000)
libxcb-util.so.1 => /usr/lib/libxcb-util.so.1 (0x00007f8a5e9f2000)
libpcre.so.1 => /usr/lib/libpcre.so.1 (0x00007f8a5e97f000)
libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0 (0x00007f8a5e8c6000)
libGLX.so.0 => /usr/lib/libGLX.so.0 (0x00007f8a5e893000)
libgraphite2.so.3 => /usr/lib/libgraphite2.so.3 (0x00007f8a5e86e000)
librt.so.1 => /usr/lib/librt.so.1 (0x00007f8a5e863000)
liblzma.so.5 => /usr/lib/liblzma.so.5 (0x00007f8a5e83b000)
liblz4.so.1 => /usr/lib/liblz4.so.1 (0x00007f8a5e819000)
libgcrypt.so.20 => /usr/lib/libgcrypt.so.20 (0x00007f8a5e6f9000)
libicudata.so.65 => /usr/lib/libicudata.so.65 (0x00007f8a5cc48000)
libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0x00007f8a5cc25000)
I have also reinstalled libqxcb but still isn't working. Can you help me? My environment is:
Operating System: Manjaro Linux
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.66.0
Qt Version: 5.14.0
Kernel Version: 5.4.13-3-MANJARO
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-3632QM CPU @ 2.20GHz
Memory: 15.3 GiB of RAM