关于Error: xz compression not available

今天在安装插件时遇到了这个错误，经网上查阅资料：https://www.centos.org/forums/viewtopic.php?t=46326

找到原因是安装软件时错误安装了CENTOS 7版本的软件导致yum不可用。

附上原文：Your "fix" removes the repository entirely. The correct fix is to remove the cached files for epel under /var/cache/yum/epel and to uninstall the EPEL *7* version of the rpm which is designed to install on CentOS/RHEL7 not on CentOS 6.

解决方法：

 gedit /root/install.log

查看安装日志，找出版本不兼容软件，卸载之即可。

注：如因为安装EPEL导致此类问题，请在安装后输入：

rm -rf /etc/yum.repos.d/epel*