rhel 5

daisulin

请各位高手 指教
[root@localhost Desktop]# yum update
Loading "rhnplugin" plugin
Loading "installonlyn" plugin
This system is not registered with RHN.
RHN support will be disabled.
Setting up Update Process
Setting up repositories
No Repositories Available to Set Up
Reading repository metadata in from local files
No Packages marked for Update/Obsoletion
我 该怎样 解决
谢谢 了