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“This system is not registered to Red Hat Subscription Management”,这个问题一定要重新安装yum吗?

    “This system is not registered to Red Hat Subscription Management”,在使用RedHat系统上使用yum命令,碰到该问题,一定要卸载原系统的yum,然后下载centos的yum安装包重新安装吗?未必!