symbol lookup error: /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5: undefined symbol: _ZN22QWindowSystemInterface24setPlatformFiltersEventsEb

GokhanKocmarli 0

Hello everyone!

I'm a Python dev, and have got an interest in learning Qt for Python. I have tried to install and work with PyQt5 before, but it gave me "xcb" error and I did research about it and gave up later than and installed PySide, it worked. Today, I need to use a Python module named "mayavi" and it requires PyQt5. I tried to install it again with pip install pyqt5 and sudo apt install python3-pyqt5 and it gave me a "xcb" error again. I searched it on the forum a bit and solve my problem with creating a symbolic link. But now, it gives me another error whenever I try to open mayavi with mayavi2 command in my terminal -- note that, I could install mayavi module after solving xcb plugin error. Here is the error it gaves me:

QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqeglfs.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/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": 330752
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqlinuxfb.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/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": 330752
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqminimal.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/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": 330752
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqminimalegl.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/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": 330752
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqoffscreen.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/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": 330752
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqvnc.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/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": 330752
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqxcb.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/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": 330752
}


Got keys from plugin meta data ("xcb")
loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
/media/xyz49/Data/Projeler/Yazılım/Python/3D-Game-of-Life-stable/bin/python: symbol lookup error: /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5: undefined symbol: _ZN22QWindowSystemInterface24setPlatformFiltersEventsEb, version Qt_5_PRIVATE_API

Is there any advice for me to solve this problem? I'm using Ubuntu 20.04.2 LTS. Some (incase if it is important) outputs:

~$ qmake --version
QMake version 3.1
Using Qt version 5.12.8 in /usr/lib/x86_64-linux-gnu

❯ apt list --installed | grep qt

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libgsettings-qt1/focal,now 0.2-1 amd64 [installed,automatic]
libqt5concurrent5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5core5a/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5dbus5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5designer5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5designercomponents5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5gui5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5help5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5multimedia5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5network5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5opengl5-dev/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5opengl5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5positioning5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5printsupport5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5qml5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5quick5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5quickwidgets5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5sensors5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5sql5-sqlite/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5sql5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5svg5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5test5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5webchannel5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5webkit5/focal,now 5.212.0~alpha4-1ubuntu2 amd64 [installed,automatic]
libqt5widgets5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
libqt5x11extras5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
libqt5xml5/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
pyqt5-dev-tools/focal,now 5.14.1+dfsg-3build1 amd64 [installed]
python3-pyqt5/focal,now 5.14.1+dfsg-3build1 amd64 [installed]
qdoc-qt5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
qhelpgenerator-qt5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
qml-module-qtgraphicaleffects/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
qml-module-qtquick-controls/focal,now 5.12.8-0ubuntu2 amd64 [installed,automatic]
qml-module-qtquick-dialogs/focal,now 5.12.8-0ubuntu2 amd64 [installed,automatic]
qml-module-qtquick-layouts/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
qml-module-qtquick-privatewidgets/focal,now 5.12.8-0ubuntu2 amd64 [installed,automatic]
qml-module-qtquick-window2/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
qml-module-qtquick2/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
qt5-assistant/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
qt5-default/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed]
qt5-gtk-platformtheme/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
qt5-qmake-bin/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
qt5-qmake/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
qtattributionsscanner-qt5/focal,now 5.12.8-0ubuntu1 amd64 [installed,automatic]
qtbase5-dev-tools/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
qtbase5-dev/focal,now 5.12.8+dfsg-0ubuntu1 amd64 [installed,automatic]
qtchooser/focal,now 66-2build1 amd64 [installed,automatic]
qttools5-dev-tools/focal,now 5.12.8-0ubuntu1 amd64 [installed]
qttranslations5-l10n/focal,focal,now 5.12.8-0ubuntu1 all [installed,automatic]
vlc-plugin-qt/focal,now 3.0.9.2-1 amd64 [installed,automatic]

~$ ls /usr/lib/x86_64-linux-gnu/ | grep qt
lrwxrwxrwx 1 root root 24 Feb 18 2020 libgsettings-qt.so.1 -> libgsettings-qt.so.1.0.0
lrwxrwxrwx 1 root root 24 Feb 18 2020 libgsettings-qt.so.1.0 -> libgsettings-qt.so.1.0.0
-rw-r--r-- 1 root root 55K Feb 18 2020 libgsettings-qt.so.1.0.0
drwxr-xr-x 7 root root 4.0K Feb 28 00:44 qt5
drwxr-xr-x 2 root root 4.0K Feb 28 00:44 qtchooser
drwxr-xr-x 3 root root 4.0K Feb 28 00:02 qt-default

Note: You can see my qt5 folder in tree view from the link here: https://pastebin.ubuntu.com/p/Chp75wyw5q/

Thank you everyone.

SGaist

Hi and welcome to devnet,

How many different versions of Python do you have ?
It looks like you are using a custom one.
Are you using a virtual env ? Conda ? Just your system Python (does not look it though) ?