I can't open qtcreator in ubuntu

[marbor]

@SGaist Can You tell me what should i do to start Qt Creator from treminal? To install Qt using special Qt app (i downloaded it qt website).

[SGaist]

Search for the Terminal application, go to the folder where you installed Qt Creator and start it.

What is your level of proficiency with Linux ?

[marbor]

From terminal:
~/Qt/Tools/QtCreator/bin$ qtcreator

Command 'qtcreator' not found, but can be installed with:

sudo apt install qtcreator

I have been using ubuntu for 2months

[SGaist]

To execute an application from its containing folder use ./name_of_executable.

[marbor]

oh, sorry
from terminal
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, xcb.

Aborted (memory dump)

[SGaist]

Start Qt Creator with the QT_DEBUG_PLUGINS environment variable set to 1. It will tell you what made the loading failed.

[marbor]

ok, but how can i do that? In trminal?

[JonB]

@marbor
Yes.

export QT_DEBUG_PLUGINS=1
./name_of_executable

[marbor]

thx you all, now works

[SGaist]

What did you have to modify ?

[raz0229]

@SGaist Had the same issue. Turns out the downloaded files were either incomplete or corrupted (Idk how). Just reinstalled

[aaron2020]

@SGaist same problem but I still can't solve it after reading your posts. 😢

[SGaist]

@aaron2020 hi and welcome to devnet,

What exactly did you do ?
What exactly did you install ?

[Leon Abascal]

I experienced the same issue. In the last step, the plugin debug warned me that libxcb-xinerama0 was missing and sudo apt-get install --reinstall libxcb-xinerama0 fixed it.
Hope it helps, cheers.

[CEmori]

@SGaist Hey, I'm getting the same problem as OP

"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, xcb.

Aborted (memory dump)"

changing the QT_DEBUG_PLUGINS variable did not change it. I reinstalled it aswell.

[SGaist]

Hi and welcome to devnet,

This environment variable triggers debugging output on the console so you get more information about what is failing.

Did you install the libraries @Leon-Abascal suggested ?

[CEmori]

@SGaist installing the missing libraries helped! Thanks a lot.

[spara7c5]

@Leon-Abascal you save my life! Same problem and same working solution! (ubuntu 21.04 in virtualbox)

[KUMAR13]

@marbor :
export QT_DEBUG_PLUGINS=1
./qtcreator
show error: Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so" : "Cannot load library
installed : sudo apt-get install --reinstall libxcb-xinerama0
this worked for me.
after installation: go for this command ./qtcreator

[f0rg3]

So I've done a number of things to try to correct this issue. Firstly, I'm on Debian 10. I installed Qt in a directory like this: /home/kevin/Applications/Qt

I've already tried reinstalling libxcb-xinerama0 as well as uninstalling and reinstalling Qt.
Here is the debug output:

./qtcreator
QFactoryLoader::QFactoryLoader() checking directory path "/home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqeglfs.so"
Found metadata in lib /home/kevin/Applications/Qt/Tools/QtCreator/lib/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/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /home/kevin/Applications/Qt/Tools/QtCreator/lib/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/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqminimal.so"
Found metadata in lib /home/kevin/Applications/Qt/Tools/QtCreator/lib/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/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqminimalegl.so"
Found metadata in lib /home/kevin/Applications/Qt/Tools/QtCreator/lib/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/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqoffscreen.so"
Found metadata in lib /home/kevin/Applications/Qt/Tools/QtCreator/lib/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/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqvnc.so"
Found metadata in lib /home/kevin/Applications/Qt/Tools/QtCreator/lib/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/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so"
Found metadata in lib /home/kevin/Applications/Qt/Tools/QtCreator/lib/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() checking directory path "/home/kevin/Applications/Qt/Tools/QtCreator/bin/platforms" ...
Cannot load library /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so: (libxcb-util.so.1: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so" : "Cannot load library /home/kevin/Applications/Qt/Tools/QtCreator/lib/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, xcb.

Aborted

As reccomended by @hskoglund in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

Hi, try: ldd /usr/lib/qt/plugins/platforms/libqxcb.so

The output of

ldd /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so

is

	linux-vdso.so.1 (0x00007fff96d31000)
	libQt5XcbQpa.so.5 => /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/../../lib/libQt5XcbQpa.so.5 (0x00007f5121d3a000)
	libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f5121cde000)
	libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f5121c22000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f5121a04000)
	libQt5Gui.so.5 => /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/../../lib/libQt5Gui.so.5 (0x00007f51210d3000)
	libQt5DBus.so.5 => /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/../../lib/libQt5DBus.so.5 (0x00007f5120e45000)
	libQt5Core.so.5 => /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/../../lib/libQt5Core.so.5 (0x00007f512064f000)
	libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f51205bb000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f512059a000)
	libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f5120595000)
	libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f512058e000)
	libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f5120389000)
	libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f5120382000)
	libxcb-util.so.1 => not found
	libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f512017f000)
	libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f512016d000)
	libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f511ff69000)
	libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f511ff5a000)
	libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f511ff53000)
	libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f511ff49000)
	libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f511ff3f000)
	libxcb-xinerama.so.0 => /lib/x86_64-linux-gnu/libxcb-xinerama.so.0 (0x00007f511ff3a000)
	libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f511ff1c000)
	libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f511fef2000)
	libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f511fcde000)
	libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f511fb9d000)
	libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f511fb92000)
	libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f511fb50000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f511fb4b000)
	libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f511f9c7000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f511f842000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f511f828000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f511f667000)
	libxcb-util.so.1 => not found
	libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f511f662000)
	libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f511f543000)
	libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f511f504000)
	libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f511f4fb000)
	libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f511f4c2000)
	libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f511f46f000)
	libicui18n.so.56 => /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/../../lib/libicui18n.so.56 (0x00007f511efd6000)
	libicuuc.so.56 => /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/../../lib/libicuuc.so.56 (0x00007f511ec1c000)
	libicudata.so.56 => /home/kevin/Applications/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/../../lib/libicudata.so.56 (0x00007f511d239000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f5122299000)
	libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f511d205000)
	libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f511d148000)
	libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007f511cf41000)
	libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f511cd3b000)
	libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f511cb35000)
	libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f511cac1000)
	libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f511ca20000)
	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f511ca06000)
	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f511c9fa000)
	liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f511c9d2000)
	liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f511c9b3000)
	libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f511c895000)
	libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f511c872000)

Any and all help is greatly appreciated, thanks for your time.