qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. #737

max-crypt · 2020-11-28T01:02:30Z

I'm on Debian 10. When I try to run joinmarket-qt.py I get the following error.

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.

The text was updated successfully, but these errors were encountered:

AdamISZ · 2020-11-28T01:06:01Z

Linking this, not because your problem is solved, but at least to give the context of my answer: https://old.reddit.com/r/joinmarket/comments/k1w2io/error_when_trying_to_install_joinmarket_on_debian/

Edit: perhaps that ldd command might help, also perhaps look into whether there is a different prescribed method for installing xinerama. For my part I will try to do a completely clean install on a Debian 10 VM tomorrow if possible, also I have reached out on IRC to see if anyone can report whether they get the same error.

max-crypt · 2020-11-28T07:04:34Z

I installed xinerama in different ways, but got the same error.

What file should I run ldd on?

EDIT: When I the following from the root directory I get no results. Is this a possible indication of the problem?

sudo find . -name "*libqxcb"
sudo find . -name "*libxcb"
sudo find . -name "*xinerama"

max-crypt · 2020-11-28T09:57:43Z

Here is the output when I run export QT_DEBUG_PLUGINS=1

QFactoryLoader::QFactoryLoader() checking directory path "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqeglfs.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqminimal.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqminimalegl.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqoffscreen.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqvnc.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqwayland-egl.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("wayland-egl")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqwayland-generic.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("wayland")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("wayland-xcomposite-egl")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("wayland-xcomposite-glx")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqwebgl.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqwebgl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331520
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so"
Found metadata in lib /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/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": 331520
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() looking at "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libxcb-xinerama.so.0.0.0"
"Failed to extract plugin meta data from '/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libxcb-xinerama.so.0.0.0'" 
         not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/joinmarket-clientserver/jmvenv/bin/platforms" ...
Cannot load library /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so: (libxcb-util.so.1: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so" : "Cannot load library /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so: (libxcb-util.so.1: cannot open shared object file: No such file or directory)"
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.

Aborted (core dumped)

AdamISZ · 2020-11-28T10:07:43Z

Yes, as per that last entry, Cannot load library /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so: (libxcb-util.so.1: cannot open shared object file: No such file or directory) - that's the shared library that's failing to load, that's why i did ldd libqxcb.so from within that directory, saw in the output which dependency was missing (xinerama) and reinstalled it. Perhaps the name of what is missing, or what is missing, is different in your case.

max-crypt · 2020-11-28T10:12:55Z

Yes, as per that last entry, Cannot load library /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so: (libxcb-util.so.1: cannot open shared object file: No such file or directory) - that's the shared library that's failing to load, that's why i did ldd libqxcb.so from within that directory, saw in the output which dependency was missing (xinerama) and reinstalled it. Perhaps the name of what is missing, or what is missing, is different in your case.

How do I reinstall it? Because I tried sudo apt install --reinstall libxcb-xinerama0 and that didn't fix the problem. Additionally, I checked /home/user/joinmarket-clientserver/jmvenv/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms/ and libqxcb.so is there.

AdamISZ · 2020-11-28T12:41:07Z

(To be clear, I don't expect you to do any of this, but since you're asking, I guess you want to try, at least): Well but ldd should show the exact *.so shared object that the operating system is not able to locate; it'll show a long list of them and there should be at least one that says 'not found' or similar (I forget the exact text). If it is indeed libxcb-xinerama0 that's the culprit, then my sudo apt install --reinstall .. was just what I found I had to do on that Ubuntu 1804VM, it might be different on Debian 10, I'm not sure.

AdamISZ · 2020-11-28T15:01:58Z

I am working on this now, not finished, but to update you:

First, I set up a clean Debian 10 Buster VM and started a fresh JM installation. I encountered the same error as before (and as you), and did ldd on the libqxcb.so, here is the output: https://pastebin.com/kaL72Lr2 - you'll note that there are now two not found messages - basically libxcb-xinerama0 and also libxcb-util.so.1 as you noted. That second one is a new missing dependency from last time I did this. More on that in a minute.

Once I realised there was a second one missing, I decided to do more searching, and I came across these two threads:

https://bugreports.qt.io/browse/QTBUG-84749 - talks about the problem with xinerama - this was started in June, exactly when I hit the problem, but there is a long discussion here, illustrating that this change broke a lot of Qt apps.

https://bugreports.qt.io/browse/QTBUG-88688 - this thread I think started only a few days ago, about the ~util file, and how the problem seems to have gotten worse.

These problems cropped up, it seemed, with PyQt5.15 , now to complicate it further, we use a wrapper library PySide2 on top of PyQt but it basically follows the Qt versions.
Essentially, some change in packaging of PyQt from 5.15 onwards has created external dependencies which it seems several Linux systems don't meet, or in any case, not out of the box, producing these extremely obscure linker errors which users cannot possibly be expected to fix (several messages in the first of those threads make that point).

I am now testing pinning PySide2 to 5.14.2 as we already pinned PyQt to 5.14.2. I think it will fix it.

AdamISZ · 2020-11-28T15:08:53Z

Indeed, as expected, that fixed it @max-crypt .. I will prepare a PR, but you can do this directly:

open joinmarket-clientserver/requirements/gui.txt, replace PySide2 with PySide2==5.14.2, then delete jmvenv and re-run ./install.sh and select the gui option, of course. After that it loads without further changes on my Debian 10 VM.

max-crypt · 2020-11-28T23:11:29Z

Replacing PySide2 with PySide2==5.14.2 in joinmarket-clientserver/requirements/gui.txt fixed it.

Thanks Adam.

AdamISZ · 2020-11-28T23:23:42Z

No worries, reopening this because it will be fixed by #739

Ghesmati · 2021-02-27T21:45:21Z

I installed Joinmarket 0.8.1 on Linux VM machine and I got error while trying to open Joinmarket-QT by python joinmarket-qt.py

File "joinmarket-qt.py", line 29, in <module>
    from PySide2.QtGui import *
ImportError: libGL.so.1: cannot open shared object file: No such file or directory

I also checked gui.txt and it is filled by PySide2==5.14.2.

AdamISZ · 2021-02-28T11:24:49Z

Hi,

Linux VM machine

Could you be more specific re: distro/operating system? (and also VM software you're using e.g. virtualbox or other)

Ghesmati · 2021-02-28T15:34:17Z

Hi, thanks for the reply.

Virtualization: kvm
Operating System: Ubuntu 20.04.2 LTS
Kernel: Linux 5.4.0-65-generic
Architecture: x86-64

AdamISZ mentioned this issue Nov 28, 2020

PySide2 version pinned to 5.14.2 #739

Merged

max-crypt closed this as completed Nov 28, 2020

AdamISZ reopened this Nov 28, 2020

AdamISZ closed this as completed in 61edd03 Nov 29, 2020

AdamISZ mentioned this issue Dec 11, 2020

Can't get to install JoinMarket on a clean Debian install #763

Closed

AdamISZ mentioned this issue Mar 9, 2021

ERROR: Could not find a version that satisfies the requirement PySide2==5.14.2 on Mac OS X (no arm) #815

Closed

kristapsk mentioned this issue Jun 18, 2021

Allow PySide2 5.14.2, 5.15.3+, 6.1+ #913

Merged

AdamISZ mentioned this issue Oct 15, 2021

joinmarket-qt.py: TypeError: 'Shiboken.ObjectType' object is not iterable #1031

Open

kristapsk mentioned this issue Nov 4, 2021

Qt: Require PySide2>=5.14 #1046

Closed

AdamISZ mentioned this issue May 18, 2022

joinmarket-qt missing package and error #1286

Closed

AdamISZ mentioned this issue Sep 7, 2022

Can't open wallet - "File is already in use" error #1343

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ss387841 mentioned this issue Dec 30, 2022

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found #1416

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qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. #737

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. #737

max-crypt commented Nov 28, 2020

AdamISZ commented Nov 28, 2020 •

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edited

max-crypt commented Nov 28, 2020

AdamISZ commented Nov 28, 2020

max-crypt commented Nov 28, 2020 •

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AdamISZ commented Nov 28, 2020

AdamISZ commented Nov 28, 2020

AdamISZ commented Nov 28, 2020

max-crypt commented Nov 28, 2020

AdamISZ commented Nov 28, 2020

Ghesmati commented Feb 27, 2021

AdamISZ commented Feb 28, 2021

Ghesmati commented Feb 28, 2021

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. #737

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. #737

Comments

max-crypt commented Nov 28, 2020

AdamISZ commented Nov 28, 2020 • edited

max-crypt commented Nov 28, 2020 • edited

max-crypt commented Nov 28, 2020

AdamISZ commented Nov 28, 2020

max-crypt commented Nov 28, 2020 • edited

AdamISZ commented Nov 28, 2020

AdamISZ commented Nov 28, 2020

AdamISZ commented Nov 28, 2020

max-crypt commented Nov 28, 2020

AdamISZ commented Nov 28, 2020

Ghesmati commented Feb 27, 2021

AdamISZ commented Feb 28, 2021

Ghesmati commented Feb 28, 2021

AdamISZ commented Nov 28, 2020 •

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max-crypt commented Nov 28, 2020 •

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max-crypt commented Nov 28, 2020 •

edited