Fedora 8下升级yum 的问题？请求大虾

[root@localhost ming]# yum update
Repository fedora is listed more than once in the configuration
Repository fedora-debuginfo is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository updates-source is listed more than once in the configuration
http://darkstar.ist.utl.pt/fedora/updates/8/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: updates. Please verify its path and try again

[root@localhost ming]# yum -y install xmms
Repository fedora is listed more than once in the configuration
Repository fedora-debuginfo is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository updates-source is listed more than once in the configuration
livna 100% |=========================| 2.1 kB 00:00
fedora 100% |=========================| 2.1 kB 00:00
adobe-linux-i386 100% |=========================| 972 B 00:00
updates-newkey 100% |=========================| 2.3 kB 00:00
fedora-debuginfo 100% |=========================| 2.1 kB 00:00
http://darkstar.ist.utl.pt/fedora/updates/8/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: updates. Please verify its path and try again


请求解答？谢谢