Ubuntu环境 解决qt.qpa.plugin:Could not load the Qt platform plugin “xcb”

Ubuntu环境下，打算用matplotlib 绘图，但在生成图片的时候报错。

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.

解决：

亲测可行。

这三个blog都是大致的思路：先找到未安装的package，然后用root权限安装。

https://blog.youkuaiyun.com/weixin_39284111/article/details/119480436

Ubuntu18.04下解决Qt出现qt.qpa.plugin:Could not load the Qt platform plugin “xcb“问题-优快云博客

[matplot]qt.qpa.plugin: Could not load the Qt platform plugin “xcb“ in ““ even though it was found.-优快云博客