Error: Cannot retrieve repository metadata (repomd.xml) for repository: elff. Please verify its path and try again CentOS 5.5でyum update しようとしたら以下のエラーが出力されてできない。http://download.elff.bravenet.com/5/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: elff. Please verify its path and try again 要は