qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

SGaist

HI,

Did you run ldd on your libraries and libxcb-xinerama versions ?

twar

Hi
Do you mean something like this?

~ $ pacman -Qo /usr/lib/libxcb-xinerama.so.0
/usr/lib/libxcb-xinerama.so.0 is owned by libxcb 1.13-1

and which file I should run this ldd on exactly?

hskoglund

Hi, try: ldd /usr/lib/qt/plugins/platforms/libqxcb.so

SGaist

You should try installing the corresponding dev packages on your system.

twar

The same as before:

~ $ ldd /usr/lib/qt/plugins/platforms/libqxcb.so
/usr/lib/qt/plugins/platforms/libqxcb.so: error while loading shared libraries: /usr/lib/libxcb-xinerama.so.0: invalid ELF header

but after that

~ $ sudo pacman -S libxcb
[sudo] password for tomasz: 
warning: libxcb-1.13-1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...

Packages (1) libxcb-1.13-1

Total Download Size:   0.99 MiB
Total Installed Size:  3.96 MiB
Net Upgrade Size:      0.00 MiB

:: Proceed with installation? [Y/n] Y
:: Retrieving packages...
 libxcb-1.13-1-x86_64          1017.5 KiB   242K/s 00:04 [##############################] 100%
(1/1) checking keys in keyring                           [##############################] 100%
(1/1) checking package integrity                         [##############################] 100%
(1/1) loading package files                              [##############################] 100%
(1/1) checking for file conflicts                        [##############################] 100%
(1/1) checking available disk space                      [##############################] 100%
:: Processing package changes...
(1/1) reinstalling libxcb                                [##############################] 100%
:: Running post-transaction hooks...
(1/1) Arming ConditionNeedsUpdate...
~ $ pacman -Qo /usr/lib/libxcb-xinerama.so.0
/usr/lib/libxcb-xinerama.so.0 is owned by libxcb 1.13-1
~ $ ldd /usr/lib/qt/plugins/platforms/libqxcb.so
	linux-vdso.so.1 (0x00007ffc93f56000)
	libQt5XcbQpa.so.5 => /usr/lib/libQt5XcbQpa.so.5 (0x00007f730ea63000)
	libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007f730e2d5000)
	libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007f730dbd4000)
	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f730d84b000)
	libc.so.6 => /usr/lib/libc.so.6 (0x00007f730d48f000)
	libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00007f730d24c000)
	libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00007f730cf83000)
	libQt5DBus.so.5 => /usr/lib/libQt5DBus.so.5 (0x00007f730ccf3000)
	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f730cad5000)
	libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0x00007f730c8d3000)
	libX11.so.6 => /usr/lib/libX11.so.6 (0x00007f730c594000)
	libXi.so.6 => /usr/lib/libXi.so.6 (0x00007f730c383000)
	libSM.so.6 => /usr/lib/libSM.so.6 (0x00007f730c17b000)
	libICE.so.6 => /usr/lib/libICE.so.6 (0x00007f730bf5f000)
	libXrender.so.1 => /usr/lib/libXrender.so.1 (0x00007f730bd54000)
	libxcb-xkb.so.1 => /usr/lib/libxcb-xkb.so.1 (0x00007f730bb37000)
	libxcb-render-util.so.0 => /usr/lib/libxcb-render-util.so.0 (0x00007f730b933000)
	libxcb-render.so.0 => /usr/lib/libxcb-render.so.0 (0x00007f730b725000)
	libxcb-sync.so.1 => /usr/lib/libxcb-sync.so.1 (0x00007f730b51e000)
	libxcb-xfixes.so.0 => /usr/lib/libxcb-xfixes.so.0 (0x00007f730b316000)
	libxcb-xinerama.so.0 => /usr/lib/libxcb-xinerama.so.0 (0x00007f730b113000)
	libxcb-randr.so.0 => /usr/lib/libxcb-randr.so.0 (0x00007f730af03000)
	libxcb-image.so.0 => /usr/lib/libxcb-image.so.0 (0x00007f730acfe000)
	libxcb-shm.so.0 => /usr/lib/libxcb-shm.so.0 (0x00007f730aafa000)
	libxcb-keysyms.so.1 => /usr/lib/libxcb-keysyms.so.1 (0x00007f730a8f7000)
	libxcb-icccm.so.4 => /usr/lib/libxcb-icccm.so.4 (0x00007f730a6f2000)
	libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007f730a4c9000)
	libxcb-shape.so.0 => /usr/lib/libxcb-shape.so.0 (0x00007f730a2c5000)
	libxkbcommon.so.0 => /usr/lib/libxkbcommon.so.0 (0x00007f730a086000)
	libxkbcommon-x11.so.0 => /usr/lib/libxkbcommon-x11.so.0 (0x00007f7309e7f000)
	libm.so.6 => /usr/lib/libm.so.6 (0x00007f7309aea000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f73098d2000)
	libGL.so.1 => /usr/lib/libGL.so.1 (0x00007f7309647000)
	libpng16.so.16 => /usr/lib/libpng16.so.16 (0x00007f7309411000)
	libharfbuzz.so.0 => /usr/lib/libharfbuzz.so.0 (0x00007f7309165000)
	libz.so.1 => /usr/lib/libz.so.1 (0x00007f7308f4e000)
	libsystemd.so.0 => /usr/lib/libsystemd.so.0 (0x00007f7308cc4000)
	libicui18n.so.61 => /usr/lib/libicui18n.so.61 (0x00007f7308819000)
	libicuuc.so.61 => /usr/lib/libicuuc.so.61 (0x00007f730845f000)
	libpcre2-16.so.0 => /usr/lib/libpcre2-16.so.0 (0x00007f73081e8000)
	libdouble-conversion.so.1 => /usr/lib/libdouble-conversion.so.1 (0x00007f7307fd8000)
	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f7307dd4000)
	libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00007f7307abd000)
	/usr/lib64/ld-linux-x86-64.so.2 (0x00007f730efdd000)
	libexpat.so.1 => /usr/lib/libexpat.so.1 (0x00007f730788b000)
	libuuid.so.1 => /usr/lib/libuuid.so.1 (0x00007f7307684000)
	libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0x00007f7307474000)
	libdbus-1.so.3 => /usr/lib/libdbus-1.so.3 (0x00007f7307223000)
	libXext.so.6 => /usr/lib/libXext.so.6 (0x00007f7307011000)
	libXau.so.6 => /usr/lib/libXau.so.6 (0x00007f7306e0d000)
	libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007f7306c07000)
	libxcb-util.so.1 => /usr/lib/libxcb-util.so.1 (0x00007f7306a01000)
	libGLX.so.0 => /usr/lib/libGLX.so.0 (0x00007f73067d0000)
	libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0 (0x00007f730651a000)
	libgraphite2.so.3 => /usr/lib/libgraphite2.so.3 (0x00007f73062ee000)
	librt.so.1 => /usr/lib/librt.so.1 (0x00007f73060e6000)
	liblzma.so.5 => /usr/lib/liblzma.so.5 (0x00007f7305ec0000)
	liblz4.so.1 => /usr/lib/liblz4.so.1 (0x00007f7305ca3000)
	libgcrypt.so.20 => /usr/lib/libgcrypt.so.20 (0x00007f7305987000)
	libicudata.so.61 => /usr/lib/libicudata.so.61 (0x00007f7303de2000)
	libpcre.so.1 => /usr/lib/libpcre.so.1 (0x00007f7303b70000)
	libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0x00007f7303950000)
~ $ qtcreator
QApplication: invalid style override passed, ignoring it.

so it seems that reinstalling libxcb fixed the issue. So thank you very much guys.
I own you really big beer :-)

@SGaist
there is no such thing on manjaro or archlinux which manjaro is baseed on

DevAlone

For those who could face the same issue and didn't solve by reinstalling libxcb: in my case the message was the same but it was caused by apps inside lxc unabling to open display, so, try to run another GUI app like xclock.

rrd0

@DevAlone

qt.qpa.xcb: could not connect to display <<-- Is that the message you're talking about?

Could you explain a little better what was your problem and how did you fix it?

What is lxc? And why to run another GUI app? I really didn't understand what you did to fix this problem.

jcren

@twar
Hi, twar!
I met the same error as yours, and I cannot solve it after using several methods.
Can you tell me how to fix it more clearly? I'm new to geant4, so I cannot understand what you have said.
Thank you!

Best Wishes,
jcren.

Ezzaat

Hi
I faced this problem and I got a new version of linuxdeployqt and now that error is gone.

NyilasLaszlo

Hi for all!
I downloaded and extracted XnView MP version 0.96 on Arch Linux and same error happened.
Képernyőkép_2020-04-16_11-56-17.png

Solution:
I am deleted these two files: libfreetype.so and libfreetype.so.6 .
Képernyőkép_2020-04-16_11-57-29.png

Képernyőkép_2020-04-16_11-58-14.png

Here is the result:
Képernyőkép_2020-04-16_11-59-08.png

jarvis

Hi ,
I am facing a similar issue could you please help.

Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqeglfs.so"
Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqlinuxfb.so"
Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqminimal.so"
Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqminimalegl.so"
Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqoffscreen.so"
Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqvnc.so"
Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqxcb.so"
Got keys from plugin meta data ("xcb")
loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/opt/appname/libs/Qt/plugins/platforms" 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.

SGaist

@jarvis said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqminimalegl.so"
Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqoffscreen.so"
Got

Hi,

Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to get more information.

Srinivas Reddy

I am using Qt-5.15.0, got the same problem.
More details are:
QLibraryPrivate::loadPlugin failed on "/opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so" : "Cannot load library /opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)"

Solved by installing the dependent package.
Command to install: sudo apt-get install libxcb-xinerama0

JamieC

Fresh install had the same issues reported here. Did what @Srinivas-Reddy suggested and install libxcb-xinerama0 and everything started working. Thanks!

PabloC

@JamieC I had the same problem, install libxcb-xinerama0 and I solved it, Thanks!

Advig

Tried reinstalling libxcb and worked for me as well.

inbdz

@Srinivas-Reddy many thanks

Lengendary

Thanks very much!
I spent several hours trying to solve this problem until I got here.
sudo apt-get install libxcb-xinerama0
Thanks!

artyjeep

@Lengendary Thank you!

singhravi

Hey guys,

I'm getting the same error but not able to find any reason.
I'm building this project, https://github.com/BelledonneCommunications/linphone-desktop
and getting the error,

(linphone) ➜  Packages git:(master) ./Linphone-4.5.1.AppImage 
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: xcb.

[1]    28317 abort (core dumped)  ./Linphone-4.5.1.AppImage
(linphone) ➜  Packages git:(master) ldd ~/Qt/5.12.9/gcc_64/plugins/platforms/libqxcb.so                         
	linux-vdso.so.1 (0x00007ffe12cd8000)
	libQt5XcbQpa.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5XcbQpa.so.5 (0x00007f79c2a18000)
	libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f79c27d3000)
	libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f79c251f000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f79c2302000)
	libQt5Gui.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Gui.so.5 (0x00007f79c1ab3000)
	libQt5DBus.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5DBus.so.5 (0x00007f79c1827000)
	libQt5Core.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Core.so.5 (0x00007f79c108c000)
	libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f79c0e00000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f79c0be1000)
	libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f79c09df000)
	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f79c07b7000)
	libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f79c05ad000)
	libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f79c039b000)
	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f79c0063000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f79bfcc5000)
	libxkbcommon-x11.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f79bfabd000)
	libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f79bf87e000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f79bf67a000)
	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f79bf2f1000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f79bf0d9000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f79bece8000)
	libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f79beae6000)
	libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f79be7cf000)
	libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f79be59d000)
	libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f79be36b000)
	libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f79be11e000)
	libicui18n.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicui18n.so.56 (0x00007f79bdc85000)
	libicuuc.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicuuc.so.56 (0x00007f79bd8cd000)
	libicudata.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicudata.so.56 (0x00007f79bbeea000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f79c2fbe000)
	libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f79bbcb9000)
	libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f79bba03000)
	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f79bb7ff000)
	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f79bb5f9000)
	libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f79bb3dd000)
	libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f79bb16b000)
	libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f79baee7000)
	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f79bacd2000)
	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f79baaca000)
	liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f79ba8a4000)
	liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f79ba688000)
	libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f79ba36c000)
	libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f79ba157000)

What could be the issue? Please suggest.
Please let me know if you need to know anything else for this.