Qt Creator + Ubuntu 20.04

fem_dev

sudo apt-get update (done!)
sudo apt install libxcb

And I got:

E: Unable to locate package libxcb

I opened the Ubuntu Terminal and wrote:

export QT_DEBUG_PLUGINS=1

So I tried to run the Address Book Qt Example: Same error...

I Tried to open the QtCreator from the same Terminal...but I got the same error...

JonB

@fem_dev
Where did you try to run the program from after typing into the shell?

fem_dev

@JonB Using QtCreator IDE...in the "run" green button...as always...

JonB

@fem_dev
In which case, doing something in a shell won't help...

Can you please go into terminal/shell, type export QT_DEBUG_PLUGINS=1, and then run your program from there? As a developer you ought know about setting environment variables.

fem_dev

@JonB Yes, I can try to do it.

But, I always used the Qt Creator green "run" button.

Is it possible yet on Ubuntu 20.04?
Or I will need to run and debug my Qt applications using Ubuntu Terminal now?

mrjj

Or I will need to run and debug my Qt applications using Ubuntu Terminal now?

no no, we just try to find out why it gives that error. i also had in Ubuntu Mint after an upgrade.

JonB

@fem_dev said in Qt Creator + Ubuntu 20.04:

But, I always used the Qt Creator green "run" button.

Then read the manual about how to set an environment variable for your running your program from within Creator.

Or I will need to run and debug my Qt applications using Ubuntu Terminal now?

No, I'm just trying to get you to do something to get some information this time, but it's proving tricky! ;-)

fem_dev

@mrjj @JonB

In the Ubuntu Terminal....I set the environment variable and run the compiled Qt example using:

./addressbook

I got this Terminal result:

QFactoryLoader::QFactoryLoader() checking directory path "/home/nyck/Qt/5.15.0/gcc_64/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqeglfs.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqminimal.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqminimalegl.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqoffscreen.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqvnc.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqwayland-egl.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqwayland-generic.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so"
Found metadata in lib /home/nyck/Qt/5.15.0/gcc_64/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 "/home/nyck/Qt/Examples/Qt-5.15.0/widgets/itemviews/build-addressbook-Desktop_Qt_5_15_0_GCC_64bit-Debug/platforms" ...
Cannot load library /home/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/home/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so" : "Cannot load library /home/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.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, xcb.

Aborted (core dumped)

nyck@gs65:~/Qt/Examples/Qt-5.15.0/widgets/itemviews/build-addressbook-Desktop_Qt_5_15_0_GCC_64bit-Debug$

Any ideas?

mrjj

Hi
Good work.

Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/nyck/Qt/Examples/Qt-5.15.0/widgets/itemviews/build-addressbook-Desktop_Qt_5_15_0_GCC_64bit-Debug/platforms" ...
Cannot load library /home/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/home/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so" : "Cannot load library /home/nyck/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)"

aha !
libxcb-xinerama

try
apt-get install libxcb-xinerama

fem_dev

@mrjj

sudo apt-get install libxcb-xinerama

E: Unable to locate package libxcb-xinerama

mrjj

@fem_dev

and you did do update ?

sudo apt-get update

fem_dev

@fem_dev

Here is how to install the libxcb-xinerama:

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

After that: it works!!!

Thank you @mrjj and @JonB

mrjj

@fem_dev
Super!
Im sure it will come often soon when people start to upgrade.

Saeed Magdy

https://poe.com/s/fqPkHzQlb2YKt6j9JeAE