错误信息：
$ yum check
Loaded plugins: fastestmirror
glibc-2.12-1.107.el6_4.5.x86_64 is a duplicate with glibc-2.12-1.107.el6_4.4.x86_64
glibc-common-2.12-1.107.el6_4.5.x86_64 is a duplicate with glibc-common-2.12-1.107.el6_4.4.x86_64
glibc-devel-2.12-1.107.el6_4.5.x86_64 is a duplicate with glibc-devel-2.12-1.107.el6_4.4.x86_64
glibc-devel-2.12-1.107.el6_4.5.x86_64 has missing requires of glibc-headers = (‘0’, ‘2.12’, ‘1.107.el6_4.5’)
iputils-20071127-17.el6_4.2.x86_64 is a duplicate with iputils-20071127-17.el6_4.x86_64
nspr-4.9.5-2.el6_4.x86_64 is a duplicate with nspr-4.9.2-1.el6.x86_64
nss-3.14.3-4.el6_4.x86_64 is a duplicate with nss-3.14.0.0-12.el6.x86_64
nss-softokn-3.14.3-3.el6_4.x86_64 is a duplicate with nss-softokn-3.12.9-11.el6.x86_64
nss-util-3.14.3-3.el6_4.x86_64 is a duplicate with nss-util-3.14.0.0-2.el6.x86_64
tzdata-2013g-1.el6.noarch is a duplicate with tzdata-2013c-2.el6.noarch
2:xinetd-2.3.14-39.el6_4.x86_64 is a duplicate with 2:xinetd-2.3.14-38.el6.x86_64
Error: check all
解决办法：
引起上述错误的原因是升级软件包的过程中重新启动计算机（或崩溃）。所以安装新的软件包，但旧的软件包没有删除。
首先安装yum软件包清除工具
yum install yum-utils -y
看看是否有任何未完成的安装，并做继续处理：yum-complete-transaction
如果上述没有解决问题，那么请使用yum-utils软件包中的软件包清除工具。
package-cleanup --dupes列出重复的包
rpm -e [duplicated packages]删除重复的包
运行删除命令之前请一定做好备份工作。