blocks|key|185584|text|从版本5开始，Qt使用platform+abstraction+system+(QPA)从底层平台中抽象出来。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|185585|每个平台的实现都是由插件提供的。对于X11，它是XCB插件。有关依赖项的更多信息，请参见Qt+for+X11+requirements。|185586|entityMap|0|LINK|mutability|MUTABLE|url|http://qt-project.org/wiki/Qt-Platform-Abstraction|1|http://qt-project.org/doc/qt-5/linux-requirements.html^0|B|X|0|0|18|N|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

Since version 5, Qt uses a <a href="http://qt-project.org/wiki/Qt-Platform-Abstraction" rel="nofollow noreferrer">platform abstraction system (QPA)</a> to abstract from the underlying platform.

The implementation for each platform is provided by plugins. For X11 it is the XCB plugin. See <a href="http://qt-project.org/doc/qt-5/linux-requirements.html" rel="nofollow noreferrer">Qt for X11 requirements</a> for more information about the dependencies.

blocks|key|186256|text|使用ldd+(man+ldd)显示共享库依赖项。在libqxcb.so上运行此程序|type|unstyled|depth|inlineStyleRanges|entityRanges|data|186257|.../platforms$+ldd+libqxcb.so|code-block|syntax|javascript|186258|显示了除了libQt5Core.so.5和libQt5Gui.so.5+(以及许多其他系统库)之外，xcb还依赖于libQt5DBus.so.5。将libQt5DBus.so.5添加到您的共享库集合中，您应该已经准备好继续下一步。|186259|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Use ldd (man ldd) to show shared library dependencies. Running this on libqxcb.so 

<pre><code>.../platforms$ ldd libqxcb.so
</code></pre>

shows that xcb depends on libQt5DBus.so.5 in addition to libQt5Core.so.5 and libQt5Gui.so.5 (and many other system libs). Add libQt5DBus.so.5 to your collection of shared libs and you should be ready to move on.

blocks|key|2803141|text|我静态地将所有Qt内容链接到我的开源项目的通用Linux构建。这会让生活变得简单一点。你只需要先构建Qt库的静态版本。当然，由于许可问题，这不能应用于封闭源代码软件。在Linux上部署Qt5应用程序目前有点问题，因为例如，Ubuntu12.04在包存储库中没有Qt5库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2803142|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I link all Qt stuff statically to the generic Linux builds of my open source projects. It makes life a bit easier. You just need to build static versions of Qt libraries first. Of course this cannot be applied to closed source software due to licensing issues. The deployment of Qt5 apps on Linux is currently a bit problematic, because Ubuntu 12.04, for example, doesn't have Qt5 libraries in the package repositories.

blocks|key|2803187|text|如前所述，您需要确保在部署应用程序时安装了平台插件。根据你想要部署东西的方式，有两种方法可以在运行时告诉你的应用程序平台插件(例如platform+/+plugins+/libqxcb.so)在哪里，这两种方法可能对你有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2803188|第一种方法是通过QT_QPA_PLATFORM_PLUGIN_PATH变量导出目录的路径。|2803189|QT_QPA_PLATFORM_PLUGIN_PATH=path/to/plugins+./my_qt_app|code-block|syntax|javascript|2803190|或|2803191|export+QT_QPA_PLATFORM_PLUGIN_PATH=path/to/plugins
./my_qt_app|2803192|另一种选择，我更喜欢的是在可执行文件所在的目录中创建一个qt.conf文件。它的内容是：|2803193|[Paths]
Plugins=/path/to/plugins|2803194|有关这方面的更多信息，请访问here和at+using+qt.conf|offset|length|2803195|entityMap|0|LINK|mutability|MUTABLE|url|http://lemirep.wordpress.com/2013/06/01/deploying-qt-applications-on-linux-and-windows-3/|1|http://qt-project.org/doc/qt-4.8/qt-conf.html^0|0|0|0|0|0|0|0|E|4|0|J|G|1|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|17|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|19|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|1B|8|@]|9|@$S|1C|T|1D|1|1E]|$S|1F|T|1G|1|1H]]|A|$]]|$1|U|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]]]

As was posted earlier, you need to make sure you install the platform plugins when you deploy your application. Depending on how you want to deploy things, there are two methods to tell your application where the platform plugins (e.g. platforms/plugins/libqxcb.so) are at runtime which may work for you.

The first is to export the path to the directory through the QT_QPA_PLATFORM_PLUGIN_PATH variable.

<pre><code>QT_QPA_PLATFORM_PLUGIN_PATH=path/to/plugins ./my_qt_app
</code></pre>

or

<pre><code>export QT_QPA_PLATFORM_PLUGIN_PATH=path/to/plugins
./my_qt_app
</code></pre>

The other option, which I prefer is to create a qt.conf file in the same directory as your executable. The contents of which would be:

<pre><code>[Paths]
Plugins=/path/to/plugins
</code></pre>

More information regarding this can be found <a href="http://lemirep.wordpress.com/2013/06/01/deploying-qt-applications-on-linux-and-windows-3/">here</a> and <a href="http://qt-project.org/doc/qt-4.8/qt-conf.html">at using qt.conf</a>

blocks|key|184109|text|在我的例子中，我需要在Ubuntu+virtualbox来宾上部署两个Qt应用程序。一个是命令行("app")，另一个是GUI_based+("app_GUI")。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|184110|我使用"ldd+app“找出了所需的库，并将它们复制到Ubuntu来宾。当命令行可执行文件"app“工作正常时，基于图形用户界面的可执行文件崩溃，给出”无法加载平台插件“xcb错误。我检查了libxcb.so的ldd，但这也没有丢失的依赖项。|offset|length|style|BOLD|184111|问题似乎是，虽然我确实复制了所有正确的库，但我意外地也复制了来宾系统中已经存在的库。这意味着(a)它们一开始就没有必要复制它们，(b)更糟糕的是，复制它们会在安装库之间产生不兼容。更糟糕的是，正如我所说的那样，它们是ldd无法检测到的。|184112|解决方案是什么？确保您复制的库被ldd和显示为缺少，绝对没有额外的库。|184113|entityMap^0|0|10|1J|0|0|K|E|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

In my case, I needed to deploy two Qt apps on an Ubuntu virtualbox guest. One was command-line ("app"), the other GUI_based ("app_GUI").

I used "ldd app" to find out what the required libs are, and copied them
to the Ubuntu guest. 
While the command-line executable "app" worked ok, the GUI-based executable crashed, giving
the "Failed to load platform plugin "xcb" error. I checked ldd for libxcb.so, but this too had no missing dependencies.

The problem seemed to be that while I did copy all the right libraries I accidentally had copied also libraries that were already present at the guest system.. meaning that (a) they were unnecessary to copy them in the first place and (b) worse, copying them produced incompatibilities between the install libraries.
Worse still, they were undetectable by ldd like I said..

The solution? Make sure that you copy libraries shown as missing by ldd and absolutely no extra libraries.

blocks|key|2803242|text|在安装Viber之后，我也遇到了同样的问题。它在/opt/viber/plugins/中包含了所有必需的qt库。我检查了/opt/viber/plugins/platforms/libqxcb.so的依赖项，发现缺少依赖项。它们是libxcb-render.so.0、libxcb-image.so.0、libxcb-icccm.so.4、libxcb-xkb.so.1，所以我通过安装以下库中缺少的包解决了我的问题：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2803243|apt-get+install+libxcb-xkb1+libxcb-icccm4+libxcb-image0+libxcb-render-util0|2803244|entityMap^0|O|J|1O|13|37|I|3Q|H|48|H|4Q|F|0|0|23|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|I|$]]

I faced the same problem when after installing Viber. It had all required qt libraries in <code>/opt/viber/plugins/</code>.
I checked dependencies of <code>/opt/viber/plugins/platforms/libqxcb.so</code> and found missing dependencies. They were <code>libxcb-render.so.0</code>, <code>libxcb-image.so.0</code>, <code>libxcb-icccm.so.4</code>, <code>libxcb-xkb.so.1</code>
So I resolved my issue by installing missing packages with this libraries:

<code>apt-get install libxcb-xkb1 libxcb-icccm4 libxcb-image0 libxcb-render-util0</code>

blocks|key|186340|text|我尝试在预装了Qt+5.7的Ubuntu16.04LTS上启动用Qt+5.5编译的二进制文件。它没有起作用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|186341|首先，我按照这里的建议，用ldd检查了二进制文件本身，并满足了所有“未找到”的依赖项。然后抛出了这个臭名昭著的This+application+failed+to+start+because+it+could+not+find+or+load+the+Qt+platform+plugin+"xcb"错误。|186342|如何在Linux中解决此问题|186343|首先，您应该在您的二进制文件所在的位置创建platforms目录，因为它是Qt查找XCB库的位置。将libqxcb.so复制到那里。我想知道为什么其他答案的作者没有提到这一点。|186344|然后，您可能希望在设置了QT_DEBUG_PLUGINS=1环境变量的情况下运行二进制文件，以检查libqxcb.so的哪些依赖项未得到满足。(您也可以按照接受答案中的建议使用ldd来完成此操作)。|186345|命令输出可能如下所示：|186346|me@xerus:/media/sf_Qt/Package$+LD_LIBRARY_PATH=.+QT_DEBUG_PLUGINS=1+./Binary
QFactoryLoader::QFactoryLoader()+checking+directory+path+"/media/sf_Qt/Package/platforms"+...
QFactoryLoader::QFactoryLoader()+looking+at+"/media/sf_Qt/Package/platforms/libqxcb.so"
Found+metadata+in+lib+/media/sf_Qt/Package/platforms/libqxcb.so,+metadata=
{
++++"IID":+"org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
++++"MetaData":+{
++++++++"Keys":+[
++++++++++++"xcb"
++++++++]
++++},
++++"className":+"QXcbIntegrationPlugin",
++++"debug":+false,
++++"version":+329472
}


Got+keys+from+plugin+meta+data+("xcb")
loaded+library+"/media/sf_Qt/Package/platforms/libqxcb.so"
QLibraryPrivate::loadPlugin+failed+on+"/media/sf_Qt/Package/platforms/libqxcb.so"+:+"Cannot+load+library+/media/sf_Qt/Package/platforms/libqxcb.so:+(/usr/lib/x86_64-linux-gnu/libQt5DBus.so.5:+version+`Qt_5'+not+found+(required+by+./libQt5XcbQpa.so.5))"
This+application+failed+to+start+because+it+could+not+find+or+load+the+Qt+platform+plugin+"xcb"
in+"".

Available+platform+plugins+are:+xcb.

Reinstalling+the+application+may+fix+this+problem.
Aborted+(core+dumped)|code-block|syntax|javascript|186347|注意失败的libQt5DBus.so.5库。将其复制到您的库路径中，在我的示例中，它与我的二进制文件所在的目录相同(因此为LD_LIBRARY_PATH=.)。重复此过程，直到满足所有依赖项为止。|186348|另外，感谢QT_DEBUG_PLUGINS=1的this+answer的作者。|186349|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/19913885/2202101^0|A|3|Z|3|0|D|3|1J|2N|0|0|L|9|1E|A|0|C|I|1D|A|2G|3|0|0|0|5|F|1P|H|0|5|I|O|B|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1G|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]|$9|1R|A|1S|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1T|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1U|8|@]|D|@]|E|$S|T]]|$1|U|3|V|5|6|7|1V|8|@$9|1W|A|1X|B|C]|$9|1Y|A|1Z|B|C]]|D|@]|E|$]]|$1|W|3|X|5|6|7|20|8|@$9|21|A|22|B|C]]|D|@$9|23|A|24|1|25]]|E|$]]|$1|Y|3|-4|5|6|7|26|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]]]

I tried to start my binary, compiled with Qt <code>5.7</code>, on Ubuntu 16.04 LTS where Qt <code>5.5</code> is preinstalled. It didn't work.
At first, I inspected the binary itself with <code>ldd</code> as was suggested here, and satisfied all &quot;not found&quot; dependencies. Then this notorious <code>This application failed to start because it could not find or load the Qt platform plugin &quot;xcb&quot;</code> error was thrown.
<h2>How to resolve this in Linux</h2>
Firstly you should create <code>platforms</code> directory where your binary is, because it is the place where Qt looks for XCB library. Copy <code>libqxcb.so</code> there. I wonder why authors of other answers didn't mention this.
Then you may want to run your binary with <code>QT_DEBUG_PLUGINS=1</code> environment variable set to check which dependencies of <code>libqxcb.so</code> are not satisfied. (You may also use <code>ldd</code> for this as suggested in the accepted answer).
The command output may look like this:
<pre><code>me@xerus:/media/sf_Qt/Package$ LD_LIBRARY_PATH=. QT_DEBUG_PLUGINS=1 ./Binary
QFactoryLoader::QFactoryLoader() checking directory path &quot;/media/sf_Qt/Package/platforms&quot; ...
QFactoryLoader::QFactoryLoader() looking at &quot;/media/sf_Qt/Package/platforms/libqxcb.so&quot;
Found metadata in lib /media/sf_Qt/Package/platforms/libqxcb.so, metadata=
{
 &quot;IID&quot;: &quot;org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3&quot;,
 &quot;MetaData&quot;: {
 &quot;Keys&quot;: [
 &quot;xcb&quot;
 ]
 },
 &quot;className&quot;: &quot;QXcbIntegrationPlugin&quot;,
 &quot;debug&quot;: false,
 &quot;version&quot;: 329472
}


Got keys from plugin meta data (&quot;xcb&quot;)
loaded library &quot;/media/sf_Qt/Package/platforms/libqxcb.so&quot;
QLibraryPrivate::loadPlugin failed on &quot;/media/sf_Qt/Package/platforms/libqxcb.so&quot; : &quot;Cannot load library /media/sf_Qt/Package/platforms/libqxcb.so: (/usr/lib/x86_64-linux-gnu/libQt5DBus.so.5: version `Qt_5' not found (required by ./libQt5XcbQpa.so.5))&quot;
This application failed to start because it could not find or load the Qt platform plugin &quot;xcb&quot;
in &quot;&quot;.

Available platform plugins are: xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)
</code></pre>
Note the failing <code>libQt5DBus.so.5</code> library. Copy it to your libraries path, in my case it was the same directory where my binary is (hence <code>LD_LIBRARY_PATH=.</code>). Repeat this process until all dependencies are satisfied.
P.S. thanks to the author of <a href="https://stackoverflow.com/a/19913885/2202101">this answer</a> for <code>QT_DEBUG_PLUGINS=1</code>.

blocks|key|2803308|text|Ubuntu+16.04+64位。我得到这个问题显然没有任何原因。前一天晚上我在我的VideoLan实例上看了一部电影，那天晚上我想和VideoLan一起看另一部电影。VLC只是不想运行，因为问题中出现了错误。我谷歌了一下，我找到了解决我的问题的解决方案:从现在开始，VLC可以像以前一样运行了。解决方案是这个命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2803309|sudo+ln+-sf+/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/+/usr/bin/|offset|length|style|CODE|2803310|我不能解释它的结果是什么，但我知道它创建了一些缺失的符号链接。|2803311|entityMap^0|0|0|1Y|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Ubuntu 16.04 64bit.
I got the problem for apparently no reasons. The night before I watched a movie on my VideoLan instance, that night I would like to watch another one with VideoLan. VLC just didn't want to run because of the error into the question.
I google a bit and I found the solution it solved my problem: from now on, VLC is runnable just like before. The solution is this comand:

<code>sudo ln -sf /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/ /usr/bin/</code>

I am not able to explain what are its consequencies, but I know it creates some missing symbolic link.

blocks|key|2803343|text|sudo+ln+-sf+/usr/lib/...."adapt-it"..../qt5/plugins/platforms/+/usr/-sf/|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2803344|它会创建遗漏的符号链接。对QT很好！对VLC很好!！|2803345|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

sudo ln -sf /usr/lib/...."adapt-it"..../qt5/plugins/platforms/ /usr/bin/

It creates the symbolic link it's missed. Good for QT ! Good for VLC !!

blocks|key|188509|text|我尝试了每个答案的主要部分，但都没有用。最终为我解决这个问题的是导出以下环境变量：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|188510|LD_LIBRARY_PATH=/usr/local/lib:~/Qt/5.9.1/gcc_64/lib
QT_QPA_PLATFORM_PLUGIN_PATH=~/Qt/5.9.1/gcc_64/plugins/+|code-block|syntax|javascript|188511|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I tried the main parts of each answer, to no avail. What finally fixed it for me was to export the following environment variables:

<pre><code>LD_LIBRARY_PATH=/usr/local/lib:~/Qt/5.9.1/gcc_64/lib
QT_QPA_PLATFORM_PLUGIN_PATH=~/Qt/5.9.1/gcc_64/plugins/ 
</code></pre>

blocks|key|188519|text|我喜欢qt.conf的解决方案。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|188520|将qt.conf放在可执行文件附近，下面几行：|188521|[Paths]
Prefix+=+/path/to/qtbase|code-block|syntax|javascript|188522|它的效果就像一个护身符:%5E)|188523|以下是一个有效的示例：|188524|[Paths]
Prefix+=+/home/user/SDKS/Qt/5.6.2/5.6/gcc_64/|188525|有关这方面的文档在这里：https://doc.qt.io/qt-5/qt-conf.html|188526|entityMap|0|LINK|mutability|MUTABLE|url|https://doc.qt.io/qt-5/qt-conf.html|1^0|3|7|3|7|0|0|1|7|0|0|0|0|0|C|Z|1|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1D|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1E|8|@]|D|@]|E|$]]|$1|Q|3|R|5|J|7|1F|8|@]|D|@]|E|$K|L]]|$1|S|3|T|5|6|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|U|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|11]]]]

I like the solution with <a href="https://doc.qt.io/qt-5/qt-conf.html" rel="nofollow noreferrer"><code>qt.conf</code></a>.
Put <code>qt.conf</code> near to the executable with next lines:
<pre><code>[Paths]
Prefix = /path/to/qtbase
</code></pre>
And it works like a charm :^)
For a working example:
<pre><code>[Paths]
Prefix = /home/user/SDKS/Qt/5.6.2/5.6/gcc_64/
</code></pre>
The documentation on this is here: <a href="https://doc.qt.io/qt-5/qt-conf.html" rel="nofollow noreferrer">https://doc.qt.io/qt-5/qt-conf.html</a>

blocks|key|188571|text|也许这些信息会有所帮助。我在Ubuntu18.04上，当我试图使用ppa方法安装Krita时，我得到了这个错误：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|188572|188573|此应用程序无法启动，因为它无法在"“中找到或加载Qt平台插件"xcb”。|blockquote|188574|188575|可用的平台插件有:+linuxfb，minimal，minimalegl，offscreen，wayland-egl，wayland，xcb。|188576|重新安装应用程序可能会解决此问题。|188577|已中止|188578|188579|我尝试了我在这个帖子和其他网站上找到的所有解决方案，但都没有成功。|188580|最后，我找到了一篇文章，作者提到可以使用这个简单的命令激活qt5的调试工具：|188581|export+QT_DEBUG_PLUGINS=1|code-block|syntax|javascript|188582|添加此命令后，我再次运行krita，我得到了相同的错误，但这一次我知道了错误的原因。|188583|188584|+libxcb-xineama.so.0:无法打开共享对象文件:没有此类文件或目录。|188585|188586|188587|此错误会阻止"xcb“正确加载。所以，解决方案是安装``libxcb+xineama.so.0“，对吗?但是，当我运行以下命令时：|188588|sudo+apt+install+libxcb-xinerama|188589|已经安装了lib。，然后我用了一个老把戏:)是的，--reinstall|CODE|188590|sudo+apt+install+--reinstall+libxcb-xinerama|188591|TLDR:最后一个命令解决了我的问题。|188592|entityMap^0|14|5|0|0|0|0|0|0|0|0|0|0|0|C|5|0|0|0|0|0|0|0|P|B|0|0|0^^$0|@$1|2|3|4|5|6|7|1K|8|@$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|1O|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1R|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1S|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1T|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1U|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|1V|8|@]|D|@]|E|$]]|$1|V|3|W|5|X|7|1W|8|@]|D|@]|E|$Y|Z]]|$1|10|3|11|5|6|7|1X|8|@$9|1Y|A|1Z|B|C]]|D|@]|E|$]]|$1|12|3|-4|5|6|7|20|8|@]|D|@]|E|$]]|$1|13|3|14|5|I|7|21|8|@]|D|@]|E|$]]|$1|15|3|-4|5|6|7|22|8|@]|D|@]|E|$]]|$1|16|3|-4|5|6|7|23|8|@]|D|@]|E|$]]|$1|17|3|18|5|6|7|24|8|@]|D|@]|E|$]]|$1|19|3|1A|5|X|7|25|8|@]|D|@]|E|$Y|Z]]|$1|1B|3|1C|5|6|7|26|8|@$9|27|A|28|B|1D]]|D|@]|E|$]]|$1|1E|3|1F|5|X|7|29|8|@]|D|@]|E|$Y|Z]]|$1|1G|3|1H|5|6|7|2A|8|@]|D|@]|E|$]]|$1|1I|3|-4|5|6|7|2B|8|@]|D|@]|E|$]]]|1J|$]]

Probably this information will help. I was on Ubuntu 18.04 and when I tried to install Krita, using the ppa method, I got this error:
<blockquote>
This application failed to start because it could not find or load the Qt platform plugin &quot;xcb&quot; in &quot;&quot;.
Available platform plugins are: linuxfb, minimal, minimalegl, offscreen, wayland-egl, wayland, xcb.
Reinstalling the application may fix this problem.
Aborted
</blockquote>
I tried all the solutions that I found in this thread and other webs without any success.
Finally, I found a post where the author mention that is possible to activate the debugging tool of qt5 using this simple command:
<pre><code>export QT_DEBUG_PLUGINS=1
</code></pre>
After adding this command I run again krita I got the same error, however this time I knew the cause of that error.
<blockquote>
libxcb-xinerama.so.0: cannot open shared object file: No such file or directory.
</blockquote>
This error prevents to the &quot;xcb&quot; to load properly. So, the solution will be install the `libxcb-xinerama.so.0&quot; right? However, when I run the command:
<pre><code>sudo apt install libxcb-xinerama
</code></pre>
The lib was already installed. Now what Teo? Well, then I used an old trick :) Yeah, that one <code>--reinstall</code>
<pre><code>sudo apt install --reinstall libxcb-xinerama
</code></pre>
TLDR: This last command solved my problem.

blocks|key|2803500|text|所以，我花了大约一天的时间试图找出问题所在；尝试了所有建议的解决方案，但没有一个像安装xcb库或导出Qt插件文件夹那样有效。建议使用QT_DEBUG_PLUGINS=1来调试这个问题的解决方案并没有像答案中那样提供给我一个直接的见解-相反，我得到了一些关于Qt5Core中未解析的符号的信息。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2803501|不过，这给了我一个提示:如果它试图使用来自不同Qt安装的不同文件怎么办？在我的机器上，我在自己编译的项目中安装了/home/username/Qt/的标准版本和一些本地构建(我在其他位置也有其他自定义构建的工具包)。每当我尝试使用任何一个工具包(由Qt维护工具安装或自己构建)时，我都会得到一个"xcb错误“。|2803502|解决方案很简单:通过CMAKE_PREFIX_PATH提供Qt路径，而不是像我那样通过Qt5_DIR提供Qt路径，它解决了问题。示例：|2803503|cmake+..+-DCMAKE_PREFIX_PATH=/home/username/Qt/5.11.1/gcc_64|2803504|entityMap^0|1U|I|0|1K|I|0|A|H|17|7|0|0|1O|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|L|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|M|$]]

So, I spent about a day trying to figure out what was the issue; tried all the proposed solutions, but none of that worked like installing xcb libs or exporting Qt plugins folder. The solution that suggested to use <code>QT_DEBUG_PLUGINS=1</code> to debug the issue didn't provide me a direct insight like in the answer - instead I was getting something about unresolved symbols within Qt5Core. 

That gave me a hint, though: what if it's trying to use different files from different Qt installations? On my machine I had standard version installed in <code>/home/username/Qt/</code> and some local builds within my project that I compiled by myself (I have other custom built kits as well in other locations). Whenever I tried to use any of the kits (installed by Qt maintenance tool or built by myself), I would get an "xcb error".

The solution was simple: provide the Qt path through <code>CMAKE_PREFIX_PATH</code> and not though <code>Qt5_DIR</code> as I did, and it solved the problem. Example:

<code>cmake .. -DCMAKE_PREFIX_PATH=/home/username/Qt/5.11.1/gcc_64</code>

blocks|key|2803515|text|我有这个问题，凭直觉我从我的环境中删除了Qt+Configs。也就是说，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2803516|rm+-rf+~/.config/Qt*|code-block|syntax|javascript|2803517|然后我启动了qtcreator，它用机器的现有状态重新配置了自己。它不再记得我的项目在哪里，但这只是意味着我不得不再次“第一次”浏览它们。|2803518|但更重要的是，它为自己构建了一组连贯的库路径，这样我就可以重新构建并运行我的项目可执行文件，而不会丢失xcb或qxcb库。|2803519|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I had this problem, and on a hunch I removed the Qt Configs from my environment. I.e.,

<pre><code>rm -rf ~/.config/Qt*
</code></pre>

Then I started qtcreator and it reconfigured itself with the existing state of the machine. It no longer remembered where my projects were, but that just meant I had to browse to them "for the first time" again.

But more importantly it built itself a coherent set of library paths, so I could rebuild and run my project executables again without the xcb or qxcb libraries going missing.

blocks|key|2803544|text|这个问题可能有很多原因。关键是要使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2803545|export+QT_DEBUG_PLUGINS=1|code-block|syntax|javascript|2803546|在运行您的Qt应用程序之前。然后，检查输出，它将为您指出错误的方向。在我的例子中是：|2803547|Cannot+load+library+/opt/nao/plugins/platforms/libqxcb.so:+(/opt/nao/bin/../lib/libz.so.1:+version+`ZLIB_1.2.9'+not+found+(required+by+/usr/lib/x86_64-linux-gnu/libpng16.so.16))|2803548|但这是在不同的线程中解决的。请参见实例https://stackoverflow.com/a/50097275/2408964。|offset|length|2803549|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/50097275/2408964^0|0|0|0|0|J|18|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

There might be many causes to this problem. The key is to use

<pre><code>export QT_DEBUG_PLUGINS=1
</code></pre>

before you run your Qt application. Then, inspect the output, which will point you to the direction of the error. In my case it was:

<pre><code>Cannot load library /opt/nao/plugins/platforms/libqxcb.so: (/opt/nao/bin/../lib/libz.so.1: version `ZLIB_1.2.9' not found (required by /usr/lib/x86_64-linux-gnu/libpng16.so.16))
</code></pre>

But that is solved in different threads. See for instance <a href="https://stackoverflow.com/a/50097275/2408964">https://stackoverflow.com/a/50097275/2408964</a>.

blocks|key|185782|text|我遇到了一个非常类似的问题，带有相同的错误消息。首先，使用命令行命令打开Qt+debug打印机来调试一些：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|185783|185784|导出QT_DEBUG_PLUGINS=1|blockquote|185785|185786|185787|并重新运行应用程序。对我来说，这揭示了以下几点：|185788|“无法加载库/home/.../miniconda3/lib/python3.7/site-packages/PyQt5/Qt/plugins/platforms/libqxcb.so：(libxkbcommon-x11.so.0:无法打开共享对象文件:没有这样的文件或目录)”|185789|185790|实际上，我缺少libxkbcommon-x11.so.0和libxkbcommon-x11.so.0。接下来，从linux命令行使用dpkg检查您的体系结构。(对我来说，命令"arch“给出了一个不同的、没有帮助的结果)|185791|185792|+dpkg+--为我打印架构#结果:+amd64|185793|185794|185795|然后我在谷歌上搜索了“libxkbcommon-x11.so.0ubuntu18.04+amd64"，同样也搜索了libxkbcommon-x11.so.0，它在packages.ubuntu.com上给出了这些包。这告诉我，在回想起来并不奇怪，我缺少名为libxkbcommon-x11-0和libxkbcommon0的包，并且安装这些包将包括所需的文件，但开发版本不会。那么解决方案是：|185796|185797|+sudo+apt-获取更新|185798|185799|sudo+apt-get+install+libxkbcommon0|185800|sudo+apt-get+install+libxkbcommon-x11-0|185801|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|17|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1B|8|@]|9|@]|A|$]]|$1|L|3|K|5|6|7|1C|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1D|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|P|3|Q|5|E|7|1F|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1I|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|X|5|E|7|1K|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1M|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|1N|8|@]|9|@]|A|$]]|$1|13|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|14|$]]

I ran into a very similar problem with the same error message. First, debug some by turning on the Qt Debug printer with the command line command:
<blockquote>
export QT_DEBUG_PLUGINS=1
</blockquote>
and rerun the application. For me this revealed the following:
&quot;Cannot load library /home/.../miniconda3/lib/python3.7/site-packages/PyQt5/Qt/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory)&quot;
&quot;Cannot load library /home/.../miniconda3/lib/python3.7/site-packages/PyQt5/Qt/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory)&quot;
Indeed, I was missing libxkbcommon-x11.so.0 and libxkbcommon-x11.so.0. Next, check your architecture using dpkg from the linux command line. (For me, the command &quot;arch&quot; gave a different and unhelpful result)
<blockquote>
dpkg --print-architecture #result for me: amd64
</blockquote>
I then googled &quot;libxkbcommon-x11.so.0 ubuntu 18.04 amd64&quot;, and likewise for libxkbcommon-x11.so.0, which yields those packages on packages.ubuntu.com. That told me, in retrospect unsurprisingly, I'm missing packages called libxkbcommon-x11-0 and libxkbcommon0, and that installing those packages will include the needed files, but the dev versions will not. Then the solution:
<blockquote>
sudo apt-get update
sudo apt-get install libxkbcommon0
sudo apt-get install libxkbcommon-x11-0
</blockquote>

blocks|key|188654|text|在我的例子中，缺少头文件是libxcb不是由Qt构建的原因。根据https://wiki.qt.io/Building_Qt_5_from_Git#Linux.2FX11安装它们解决了问题：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|188655|yum+install+libxcb+libxcb-devel+xcb-util+xcb-util-devel+mesa-libGL-devel+libxkbcommon-devel|code-block|syntax|javascript|188656|entityMap|0|LINK|mutability|MUTABLE|url|https://wiki.qt.io/Building_Qt_5_from_Git#Linux.2FX11^0|D|6|W|1H|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

In my case missing header files were the reason <code>libxcb</code> was not built by Qt. Installing them according to <a href="https://wiki.qt.io/Building_Qt_5_from_Git#Linux.2FX11" rel="nofollow noreferrer">https://wiki.qt.io/Building_Qt_5_from_Git#Linux.2FX11</a> resolved the issue:

<pre><code>yum install libxcb libxcb-devel xcb-util xcb-util-devel mesa-libGL-devel libxkbcommon-devel
</code></pre>

blocks|key|186495|text|你所要做的就是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|186496|pip+uninstall+PyQt5+|code-block|syntax|javascript|186497|和|186498|conda+install+pyqt+|186499|pyqt的大部分问题都可以通过这个最简单的解决方案来解决。|186500|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

All you need to do is
<pre><code>pip uninstall PyQt5 
</code></pre>
and
<pre><code>conda install pyqt 
</code></pre>
Most of the problem of pyqt can be fixed by this simplest solution.

blocks|key|3016071|text|想要在Ubuntu+20.04上开始使用它的人们，请尝试运行它，看看这是否能解决问题。这对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3016072|sudo+apt-get+update+-y
sudo+apt-get+install+-y+libxcb-xinerama0|code-block|syntax|javascript|3016073|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Folks trying to get this started on Ubuntu 20.04 please try to run this and see if this solves the problem. This worked for me
<pre><code>sudo apt-get update -y
sudo apt-get install -y libxcb-xinerama0
</code></pre>

I wrote application for linux which uses Qt5.

But when I am trying to launch it on the linux without Qt SDK installed, the output in console is:

<blockquote>
 Failed to load platform plugin "xcb". Available platforms are:
</blockquote>

How can I fix this? May be I need to copy some plugin file?
When I use ubuntu with Qt5 installed, but I rename Qt directory, the same problem occurs. So, it uses some file from Qt directory...

UPDATE:
when I create in the app dir "platforms" folder with the file libqxcb.so, the app still doesnot start, but the error message changes:

<blockquote>
 Failed to load platform plugin "xcb". Available platforms are:
 
 xcb
</blockquote>

How can this happen? How can platform plugin be available but can't be loaded?

"Failed to load platform plugin "xcb" " while launching qt5 app on linux without qt installed

Ubuntu

Linux

我为linux写了一个使用Qt5的应用程序。但是，当我尝试在没有安装Qt SDK的linux上启动它时，控制台中的输出是：无法加载平台插件"xcb“。可用的平台包括：我该如何解决这个问题呢？也许我需要复制一些插件文件？当我使用安装了Qt5的ubuntu，但是我重命名了Qt目录，同样的问题也发生了。所以，它使用了Qt目录...

问在未安装qt的linux上启动qt5应用程序时，无法加载平台插件"xcb“
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问在未安装qt的linux上启动qt5应用程序时，无法加载平台插件"xcb“EN

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问在未安装qt的linux上启动qt5应用程序时，无法加载平台插件"xcb“
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