Qt: Session management error: None of the authentication protocols specified are supported
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Qt是可能出现一下警告，不过可以忽略，程序照样可以运行，这并不是错误。
1、QGtkStyle was unable to detect the current GTK+ theme.
2、Qt: Session management error: None of the authentication protocols specified are supported
折腾了好久，终于找到答案了。
第一个警告解决：gedit /etc/X11/xinit/.xinitrc,添加一行export GTK2_RC_FILES="$HOME/.gtkrc-2.0"
第二个警告解决：在使用root登录是就会出现这种问题，切换成普通用户及可。由于在ubuntu下本人习惯使用命令su切换到root下打开qtcreator编程，所以出现以上问题，于是使用命令 su chen切换回普通用户（chen是我的普通用户名）。
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