安裝QT可能會發生的問題，跟解決辦法

參考的官方文件
https://wiki.qt.io/Install_Qt_5_on_Ubuntu

安裝完後，執行QT creator，可能會發生的問題是

garygu@garygu-UX330UA:~/Qt/Tools/QtCreator/bin$ ./qtcreator
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 (core dumped)

看起來是在run的過程中有缺少shared library，以下網站也有提到。

https://stackoverflow.com/questions/17106315/failed-to-load-platform-plugin-xcb-while-launching-qt5-app-on-linux-without

所以透過ldd 可以知道有哪些shared library是有缺少的。從not found的library下手安裝就行了。

garygu@garygu-UX330UA:~/Qt/Tools/QtCreator/lib/Qt/plugins/platforms$ ldd libqxcb.so 

linux-vdso.so.1 (0x00007fff229e2000)

libQt5XcbQpa.so.5 => /home/garygu/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/./../../lib/libQt5XcbQpa.so.5 (0x00007ffb4854a000)

libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007ffb48305000)

libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007ffb48051000)

libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ffb47e34000)

libQt5Gui.so.5 => /home/garygu/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/./../../lib/libQt5Gui.so.5 (0x00007ffb4760d000)

libQt5DBus.so.5 => /home/garygu/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/./../../lib/libQt5DBus.so.5 (0x00007ffb47381000)

libQt5Core.so.5 => /home/garygu/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/./../../lib/libQt5Core.so.5 (0x00007ffb46bee000)

libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007ffb46962000)

libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ffb46743000)

libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007ffb46541000)

libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007ffb46319000)

libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007ffb4610f000)

libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007ffb45efd000)

libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007ffb45bc5000)

libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ffb45827000)

libxkbcommon-x11.so.0 => not found

libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007ffb455e8000)

libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ffb453e4000)

libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ffb4505b000)

libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ffb44e43000)

libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ffb44a52000)

libxkbcommon-x11.so.0 => not found

libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007ffb44850000)

libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007ffb44539000)

libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007ffb44307000)

libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007ffb440d5000)