QT xcb issues with 4.1+ AppImage

Hello – I recently updated my AppImage from 4.0.9 to 4.1.2, and I can no longer get Electrum to run. There seems to be some QT issues going on. The primary error “Could not load the QT Platform plugin “xcb” in “” even though it was found.” seems to have popped up a lot with Arch users for a variety of applications. However I’m running Debian 10 with MATE desktop. Additionally I’m accessing through VNC – not sure if this causes extra complexities. I’ve tried installing some various xcb packages, but that doesn’t help (but I shouldn’t need to install more stuff for an AppImage anyway, right?)

Here’s the output of running with QT_DEBUG_PLUGINS=1

QFactoryLoader::QFactoryLoader() checking directory path "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqeglfs.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqminimal.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqminimalegl.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqoffscreen.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqvnc.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-egl.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-generic.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwebgl.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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 "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so"
Found metadata in lib /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/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() checking directory path "/tmp/.mount_electrJ8ESTc/usr/bin/platforms" ...
Cannot load library /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so: (libxcb-randr.so.0: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so" : "Cannot load library /tmp/.mount_electrJ8ESTc/usr/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so: (libxcb-randr.so.0: 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

I can still run 4.0.9 for the timebeing, but would like to be able to update if I can.

[SomberNight]

I think we should just bundle all these libxcb-* packages… Luckily they are fairly small in size. I’ve tested building an AppImage from https://github.com/spesmilo/electrum/commit/4e91555d56edb0f1a167736219f61550cd01a309 and that can launch properly on my fresh debian VM.

@EchterAgo you might be interested in this

[SomberNight]

See https://doc.qt.io/qt-5/linux-requirements.html

Note: From Qt 5.15 onwards, Qt does require libxcb 1.11. Also, the -qt-xcb configure option got removed that was bundling some of the libs below.