qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
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@JKSH, I entered the required command and here's the output I got
curiouspan@curiouspan-VirtualBox:~$ ldd /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so linux-vdso.so.1 (0x00007fffc8770000) libQt6XcbQpa.so.6 => not found libQt6Gui.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6Gui.so.6 (0x00007f0873306000) libQt6Core.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6Core.so.6 (0x00007f087295d000) libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f087277c000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f087258a000) libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f0872573000) libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f0872436000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f0872430000) libQt6DBus.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6DBus.so.6 (0x00007f0872262000) libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f087222e000) libOpenGL.so.0 => /lib/x86_64-linux-gnu/libOpenGL.so.0 (0x00007f0872202000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f08721dd000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f087208e000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f0872073000) /lib64/ld-linux-x86-64.so.2 (0x00007f08742b7000) libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f0871fbb000) libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f0871f91000) libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f0871f89000) libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f0871f81000) libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f0871f67000)
How can I install this
libQt6XcbQpa.so.6
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@CuriousPan
@JKSH asked you to look at yourconfigure
log to see what you had set to build, since you are building Qt6 yourself, not downloading it. -
@CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:
How can I install this
libQt6XcbQpa.so.6
?This is part of Qt.
Since your build was missing
libQt6XcbQpa.so
andlibqxcb.so
, it probably means your system did not fulfil the requirements to build Qt's XCB plugin (again, check your configure log)You might be able to get a copy of
libQt6XcbQpa.so
from your colleague, but it would be better to find out why it didn't build in the first place. -
@CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:
how can I see configure log? Is there some log file?
Its config.log text file in the folder where you called configure...
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@jsulm, Hello.
I have foundconfigure.summary
file. Here's the content for it. Is this what you meant?Building for: linux-g++ (x86_64, CPU features: mmx sse sse2) Compiler: gcc 9.3.0 Build options: Mode ................................... debug Optimize debug build ................... no Fully optimize release builds (-O3) .... no Building shared libraries .............. yes Using C standard ....................... C11 Using C++ standard ..................... C++17 Using ccache ........................... no Using new DTAGS ........................ yes Generating GDB index ................... no Relocatable ............................ yes Using precompiled headers .............. yes Using LTCG ............................. no Target compiler supports: SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX .................................. AVX AVX2 AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI Other x86 ............................ AES F16C RDRAND SHA Intrinsics without compiler architecture option yes Sanitizers: Addresses ............................ no Threads .............................. no Memory ............................... no Fuzzer (instrumentation only) ........ no Undefined ............................ no Build parts ............................ libs tools Qt modules and options: Qt Concurrent .......................... yes Qt D-Bus ............................... yes Qt D-Bus directly linked to libdbus .... no Qt Gui ................................. yes Qt Network ............................. yes Qt Sql ................................. yes Qt Testlib ............................. yes Qt Widgets ............................. yes Qt Xml ................................. yes Support enabled for: Using pkg-config ....................... yes udev ................................... no Using system zlib ...................... no Zstandard support ...................... no Thread support ......................... yes Qt Core: backtrace .............................. yes DoubleConversion ....................... yes Using system DoubleConversion ........ no GLib ................................... no ICU .................................... no Using system libb2 ..................... no Built-in copy of the MIME database ..... yes Tracing backend ........................ <none> Logging backends: journald ............................. no syslog ............................... no slog2 ................................ no PCRE2 .................................. yes Using system PCRE2 ................... no CLONE_PIDFD support in forkfd .......... yes Qt Sql: SQL item models ........................ yes Qt Network: getifaddrs() ........................... yes IPv6 ifname ............................ yes libproxy ............................... no Linux AF_NETLINK ....................... yes OpenSSL ................................ no Qt directly linked to OpenSSL ........ no OpenSSL 1.1 ............................ no DTLS ................................... no OCSP-stapling .......................... no SCTP ................................... no Use system proxies ..................... yes GSSAPI ................................. no Brotli Decompression Support ........... no Qt Gui: Accessibility .......................... yes FreeType ............................... yes Using system FreeType ................ no HarfBuzz ............................... yes Using system HarfBuzz ................ no Fontconfig ............................. no Image formats: GIF .................................. yes ICO .................................. yes JPEG ................................. yes Using system libjpeg ............... no PNG .................................. yes Using system libpng ................ no Text formats: HtmlParser ........................... yes CssParser ............................ yes OdfWriter ............................ yes MarkdownReader ....................... yes Using system libmd4c ............... no MarkdownWriter ....................... yes EGL .................................... yes OpenVG ................................. no OpenGL: Desktop OpenGL ....................... yes OpenGL ES 2.0 ........................ no OpenGL ES 3.0 ........................ no OpenGL ES 3.1 ........................ no OpenGL ES 3.2 ........................ no Vulkan ................................. no Session Management ..................... yes Features used by QPA backends: evdev .................................. yes libinput ............................... no INTEGRITY HID .......................... no mtdev .................................. no tslib .................................. no xkbcommon .............................. no X11 specific: XLib ................................. yes XCB Xlib ............................. no EGL on X11 ........................... yes xkbcommon-x11 ........................ no QPA backends: DirectFB ............................... no EGLFS .................................. yes EGLFS details: EGLFS OpenWFD ........................ no EGLFS i.Mx6 .......................... no EGLFS i.Mx6 Wayland .................. no EGLFS RCAR ........................... no EGLFS EGLDevice ...................... no EGLFS GBM ............................ no EGLFS VSP2 ........................... no EGLFS Mali ........................... no EGLFS Raspberry Pi ................... no EGLFS X11 ............................ no LinuxFB ................................ yes VNC .................................... yes VK_KHR_display ......................... no QNX: lgmon ................................ no IMF .................................. no XCB: Using system-provided xcb-xinput ..... no GL integrations: GLX Plugin ......................... no XCB GLX .......................... no EGL-X11 Plugin ..................... yes Windows: Direct 2D ............................ no Direct 2D 1.1 ........................ no DirectWrite .......................... no DirectWrite 3 ........................ no Qt Widgets: GTK+ ................................... no Styles ................................. Fusion Windows Qt Testlib: Tester for item models ................. yes Qt PrintSupport: CUPS ................................... no Qt Sql Drivers: DB2 (IBM) .............................. no InterBase .............................. no MySql .................................. no OCI (Oracle) ........................... no ODBC ................................... no PostgreSQL ............................. no SQLite ................................. yes Using system provided SQLite ......... no Core tools: qmake tool ............................. yes Qt QML: QML network support .................... yes QML debugging and profiling support .... yes QML just-in-time compiler .............. yes QML sequence object .................... yes QML XML http request ................... yes QML Locale ............................. yes Qt QML Models: QML list model ......................... yes QML delegate model ..................... yes Qt Quick: AnimatedImage item ..................... yes Canvas item ............................ yes Support for Qt Quick Designer .......... yes Flipable item .......................... yes GridView item .......................... yes ListView item .......................... yes TableView item ......................... yes Path support ........................... yes PathView item .......................... yes Positioner items ....................... yes Repeater item .......................... yes ShaderEffect item ...................... yes Sprite item ............................ yes Qt Quick Templates 2: Hover support .......................... yes Multi-touch support .................... yes Qt Quick Controls 2: Styles ................................. Basic Fusion Imagine Material Universal macOS Windows
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@CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:
Features used by QPA backends: ... xkbcommon .............................. no X11 specific: XLib ................................. yes XCB Xlib ............................. no EGL on X11 ........................... yes xkbcommon-x11 ........................ no ... QPA backends: ... XCB: Using system-provided xcb-xinput ..... no GL integrations: GLX Plugin ......................... no XCB GLX .......................... no EGL-X11 Plugin ..................... yes
You need "yes" on all of these. "no" means you were missing the dependencies.
You should:
- Clean out your build tree (i.e. delete all files that were not part of the original source code)
- Install all the dependencies for Ubuntu at https://wiki.qt.io/Building_Qt_5_from_Git (pay particular attention to the "Libxcb" section)
- Run
configure
again. Make sure you get "yes" on all of the above. - Run
make
to build Qt.
You should now have all the XCB-related libraries.
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@CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:
@JKSH, thank you for response. I will try mentioned steps. But is it relevant for Qt6 too?
You're welcome.
Yes, I believe the XCB requirements for Qt 5 and Qt 6 are very similar (or even identical)
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Dears,
Could you please help? I'm trying to open turtlesim on my Unbutu 20.04 that I installed on my windows10 computer from the Microsoft store and that is what I'm gettingrosrun turtlesim turtlesim_node
qt.qpa.xcb: could not connect to display
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: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
Aborted (core dumped)
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@Zayn said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:
Unbutu 20.04 that I installed on my windows10 computer from the Microsoft store
The Windows Subsystem for Linux does not support GUIs. So you cannot run any apps that need XCB.
You have 2 options:
- Install a full Ubuntu desktop instead, either on a physical machine or a virtual machine.
- Wait until WSLg is released to the general public: https://devblogs.microsoft.com/commandline/the-initial-preview-of-gui-app-support-is-now-available-for-the-windows-subsystem-for-linux-2/
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@Zayn
I had the same problem running p4merge on WSL2First, what you have to do is to install an xserver on windows, like VcXSrv.
Then create a shortcut for the xserver (optional)"C:\Program Files\VcXsrv\vcxsrv.exe" :0 -ac -terminate -lesspointer -multiwindow -clipboard -wgl -dpi auto
Then in Ubuntu set the xserver display in ~/.bashrc
export DISPLAY=$(ip route | awk '{print $3; exit}'):0 export LIBGL_ALWAYS_INDIRECT=1 export XCURSOR_SIZE=16
Then install the xcb dependency (found at https://wiki.qt.io/Building_Qt_5_from_Git )
sudo apt-get install '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev
Maybe from the last not everything is really needed, but after that it worked for me.
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@homer9 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:
@corebonts Thanks ! That's solves the issue
The workaround posted by @corebonts should no longer be needed. WSL2 now supports GUIs out-of-the-box: https://learn.microsoft.com/en-us/windows/wsl/tutorials/gui-apps
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@corebonts thx for your solution, solved for me now
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@corebonts Thanks a lot brother it worked for me.