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

stounhange7

@coffeesmoke thanks for the help. you revived my qt on debian 10

1init

@coffeesmoke thank you for this i ran the debian 9 instructions after installing the updates and had this issue
i run devuan

Malachi

That symlink seems a little risky. Two worries:

What happens when the actual v1+ of the actual libxcb-util attempts to install?
Are you 100% sure Qt Creator isn't depending on a different API? Seems like a dice roll

I admit though, it's better than nothing

EDIT: A few minutes of browsing https://gitlab.freedesktop.org/xorg/lib/libxcb-util/-/blob/master/NEWS suggests that no API changes are there and that symlinking is probably API compliant in this case. Funny that Debian is 6 years behind on this lib. No judging. I know they gotta test stuff. Just funny :)

SlySven

Assuming that version 0 of something is a pre-first version release and that Devuan 3.0 "Beowulf" (systemd-less fork of Debian 10.0 "Buster") only has the 0.0.0 version then I guess symlinking the 0.0.0 to the 1.0.0 is the only chance we've got. I just got clobbered by this when running the Qt Creator updater from within the last version that was giving me Qt 5.15.1 that told me that there was an update available. It is a real PITA when it upgraded itself out of working...

... however this topic has worked for me.

BTW The Devuan libxcb-util 0.0.0 version libraries do date back to 20 Aug 2014!

beetree

@coffeesmoke

As for Debian. The correct library is found as of Debian 11. Which at the moment is in testing.

Qt application fails to start on Debian 10 Buster because libqxcb.so requires missing libxcb-util.so.1

Symlink to a different library version is a possible workaround, but does not guarantee everything else works as expected, and as such ill advised.

saulesquivelg

I had the same problem after installing QT in Ubuntu 18.04, I've solved it with sudo apt install libxcp-xinerama0

coffeesmoke

@beetree I agree. Alternatively , a virtual machine. But if you do not want to install the VM, you need to save the changes in the notations to yourself to be able to return to the original version.

Alexreell

@Jimit-Rupani Thank you, the first 2 points on kali linux helped me

Niffo

@coffeesmoke Thank you VERY much !

sheril

@Srinivas-Reddy
Thanks.

requinham

@Lengendary Thanks, this resolve the problem for me on Ubuntu 18.04 Qt 5.15.2

CoreDump

Environment: Ubuntu20.10; Qt 5.15.2, VirtualBox VM:

The solution provided by @Legendary no longer works, use this instead:

$ sudo apt-get install libxcb-randr0-dev libxcb-xtest0-dev libxcb-xinerama0-dev libxcb-shape0-dev libxcb-xkb-dev

roboTURx

@coffeesmoke thanks a lot ~ this works for me

Deep61803

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

ibxcb-xinerama0

Thank you, This solution helped me also.

trimixotun

It's looks slightly outdated, but maybe it someone helps:

Debian 10 x86-64.
LXDE
Fresh net install Qt 5.12.10

Qtcreator first launch problem: "qt.qpa.plugin: Could not load the Qt platform plugin "xcb"".

Nothing from above helps at all. Qtcreator needs libxcb-util.so.1, but system has only libxcb-util.so.

Simple solution:

sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

All work, folks.

wobl

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

sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

Thanks a lot ... this is working for MX Linux too - but with a little correction:

sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

nileshmoodley

@Srinivas-Reddy Thank you very much - this solved it for me!

Jean-Noel

For me (on Debian), the only thing that worked was to completely uninstall Qt with Maintenance Tool, and install with "default" configuration.

ajlogo

The plugin problem started when I re-created an Anaconda env (PyQt5 and ubuntu) from a .yml file.
https://newini.wordpress.com/2020/08/13/how-to-solve-xcb-plugin-error-in-pyqt5/
Had the working answer for me:
sudo apt-get install qt5-default # For Ubuntu system

pixel_08

@SGaist hi,
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, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.
/bin/bash: line 133: 1745 Aborted (core dumped) python csv2txt.py

Then I added, export QT_DEBUG_PLUGINS=1
got error as,
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/bin/platforms" ...
Cannot load library /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so: (libxcb-util.so.1: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so" : "Cannot load library /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so: (libxcb-util.so.1: cannot open shared object file: No such file or directory)"

and ran ldd /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so

linux-vdso.so.1 (0x00007ffc728e9000)
libQt5XcbQpa.so.5 => /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/../../lib/libQt5XcbQpa.so.5 (0x00007fda88aa2000)
libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007fda88a50000)
libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007fda88994000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fda88776000)
libQt5Gui.so.5 => /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/../../lib/libQt5Gui.so.5 (0x00007fda87e45000)
libQt5DBus.so.5 => /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/../../lib/libQt5DBus.so.5 (0x00007fda87bb7000)
libQt5Core.so.5 => /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/../../lib/libQt5Core.so.5 (0x00007fda873c1000)
libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007fda8732d000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fda8730c000)
libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007fda87307000)
libxcb-icccm.so.4 => /usr/lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007fda87300000)
libxcb-image.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007fda870f9000)
libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007fda870f4000)
libxcb-util.so.1 => not found
libxcb-keysyms.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007fda86ef1000)
libxcb-randr.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007fda86edf000)
libxcb-render-util.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007fda86cdb000)
libxcb-render.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007fda86cca000)
libxcb-shape.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007fda86cc5000)
libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007fda86cbb000)
libxcb-xfixes.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007fda86cb1000)
libxcb-xinerama.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xinerama.so.0 (0x00007fda86cac000)
libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007fda86c8e000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fda86c62000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007fda86a50000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007fda8690f000)
libxkbcommon-x11.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007fda86904000)
libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007fda868c2000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fda868bd000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fda86737000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fda865b4000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fda8659a000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fda863d9000)
libxcb-util.so.1 => not found
libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007fda863d4000)
libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007fda862b3000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fda86276000)
libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007fda8626d000)
libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007fda86234000)
libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007fda861e1000)
libicui18n.so.56 => /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/../../lib/libicui18n.so.56 (0x00007fda85d46000)
libicuuc.so.56 => /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/../../lib/libicuuc.so.56 (0x00007fda8598e000)
libicudata.so.56 => /builds/sravani_detect/video_frames/venv/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/../../lib/libicudata.so.56 (0x00007fda83fab000)
/lib64/ld-linux-x86-64.so.2 (0x00007fda89001000)
libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fda83f77000)
libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fda83eba000)
libxcb-util.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007fda83cb1000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007fda83aad000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fda838a7000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007fda83833000)
libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007fda83790000)
libbsd.so.0 => /usr/lib/x86_64-linux-gnu/libbsd.so.0 (0x00007fda83776000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fda8376c000)
liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fda83744000)
liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007fda83725000)
libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007fda83607000)
libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007fda835e2000)

what to do next?
Thank you!