This application failed-to-start because it could not find or load the Qt platform plugin "XCB".

Linux QT5 program Packaging

QT5 compiled program under Linux system will report the following error when running without QT installation:

This application failed-to-start because it could not find or load the Qt platform plugin "XCB".

Reinstalling the application may fix this problem.

This error occurred mainly because QT5 was using a new technology-----Platform Abstraction System (QPA) in order to be more portable under multiple platforms, The library in it also relies on a library file libqt5dbus.so.5 in Qt5, so just add this file when you package it.

Linux Next QT5 program packaging steps are as follows

1. Put the following 7 library files into the/usr/lib directory

Libqt5widgets.so.5
Libqt5gui.so.5
Libqt5core.so.5
libicui18n.so.51
libicuuc.so.51
libicudata.so.51

Libqt5dbus.so.5

2. Copy the platforms directory in the QT5 installation directory to make it and your QT program Sibling directory

Now you can double-click your program to run it huh

This application failed-to-start because it could not find or load the Qt platform plugin "XCB".