这两天在更新CentOS7系统时，出现了Multilib version problems错误，执行命令：

# yum update

出现了的错误信息：

....---> Package libcap-ng.i686 0:0.7.5-4.el7 will be installed---> Package libstdc++.i686 0:4.8.5-16.el7 will be installed--> Finished Dependency ResolutionError:  Multilib version problems found. This often means that the root       cause is something else and multilib version checking is just       pointing out that there is a problem. Eg.:         1. You have an upgrade for glibc which is missing some            dependency that another package requires. Yum is trying to            solve this by installing an older version of glibc of the            different architecture. If you exclude the bad architecture            yum will tell you what the root cause is (which package            requires what). You can try redoing the upgrade with            --exclude glibc.otherarch ... this should give you an error            message showing the root cause of the problem.         2. You have multiple architectures of glibc installed, but            yum can only see an upgrade for one of those architectures.            If you don't want/need both architectures anymore then you            can remove the one with the missing update and everything            will work.         3. You have duplicate versions of glibc installed already.            You can use "yum check" to get yum show these errors.       ...you can also use --setopt=protected_multilib=false to remove       this checking, however this is almost never the correct thing to       do as something else is very likely to go wrong (often causing       much more problems).       Protected multilib versions: glibc-2.17-196.el7.i686 != glibc-2.17-157.el7_3.1.x86_64Error: Protected multilib versions: pcre-8.32-17.el7.i686 != pcre-8.32-15.el7_2.1.x86_64Error: Protected multilib versions: elfutils-libs-0.168-8.el7.i686 != elfutils-libs-0.166-2.el7.x86_64......

解决过程如下：

//查询重复的软件包# rpm -q systemd-libssystemd-libs-219-30.el7.x86_64systemd-libs-219-42.el7_4.1.x86_64//删除旧版# rpm -e systemd-libs-219-30.el7.x86_64error: Failed dependencies:    systemd-libs = 219-30.el7 is needed by (installed) libgudev1-219-30.el7.x86_64//仍然出现依赖问题，继续查询libgudev1的版本信息# rpm -q libgudev1libgudev1-219-30.el7.x86_64//发现只有一个版本，升级试一下# yum update libgudev1......Updated:  libgudev1.x86_64 0:219-42.el7_4.1                                                                                                                                                                                                                                             Complete!# rpm -q libgudev1libgudev1-219-42.el7_4.1.x86_64//升级完成后，删除旧版本的systemd-libs# rpm -e systemd-libs-219-30.el7.x86_64# rpm -q systemd-libssystemd-libs-219-42.el7_4.1.x86_64

最后查询发现只剩下最新版本的systemd-libs，其他重复版本包的解决，也是同样的过程。

rpm -q package-namesrpm -e package-full-version