qt.qpa.plugin: Could not load the Qt platform plugin “xcb“ in ““ even though it was found.（解决办法）

1. Error message

Environment: ubuntu16.04 

Error: (when pyqt5 is installed)

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, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.

Aborted (core dumped)

2. Solution

sudo apt install libxcb-xinerama0 

Perfect solution! ! !