fedora22 dnf安装软件All mirrors were already tried without success的错误

系统为fedora22，使用dnf安装软件或者更新系统，提示Status code: 404以及All mirrors were already tried without success。

 

经过google，发现解决办法，如下：

 

1、执行命令“dnf clean metadata”

2、重新安装程序或更新系统

 

方法来自于http://forums.fedoraforum.org/showthread.php?t=304926