qt.qpa.screen: QXcbConnection: Could not connect to display

命令行执行报错：

qt.qpa.screen: QXcbConnection: Could not connect to display 
Could not connect to any X display.

解决方案很简单：

export DISPLAY=':0.0'

来源：CSDN

作者：david-cao

链接：https://blog.csdn.net/caozhantao/article/details/84672101