qt 安装后启动失败
问题描述：qt正常安装，启动时报错qt.qpa.plugin: Could not load the Qt platform plugin “xcb” in “” even though it was found.
解决过程：
a. 查阅qt论坛：https://forum.qt.io/topic/93247/qt-qpa-plugin-could-not-load-the-qt-platform-plugin-xcb-in-even-though-it-was-found/3
b. run your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see what might go wrong when the plugin is loaded.
export QT_DEBUG_PLUGINS=1
c. 发现是由于库缺失导致的，apt-file search
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