原帖地址：https://www.myzhenai.com/thread-14329-1-1.html
Centos6.0更新系统的时候如果出现　failure: repodata/filelists.xml.gz from debug: [Errno 256]　提示，
解决方法很简单：
打开一个终端窗口（类似于微软系统里的命令行提示符窗口）
yum clean all
回车即可.
Loaded plugins: aliases, changelog, downloadonly, fastestmirror, kabi, presto,
: priorities, protect-packages, refresh-packagekit, security,
: tmprepo, verify, versionlock
Loading support for CentOS kernel ABI
Cleaning up Everything
Cleaning up list of fastest mirrors
0 delta-package files removed, by presto