Dear friends: [Using Scientific Linux 4, a derivative of RHEL4] I've been using Scientific Linux (SL) for several weeks. Have had no problem with yum until two days ago. At first, I got the following error message: [sher@localhost ~]$ yum list available |more Cannot open/read repomd.xml file for repository: dag Cannot find repomd.xml file for dag Setting up Repos [sher@localhost ~]$ Then, a day later I got a different error message. Please see below: Here is the output of my /etc/yum.repos.d subdirectory: ["sl" stands for Scientific Linux, a derivative of Fedora4/RH4] Benjamin Sher wrote: [sher@localhost ~]$ cd /etc/yum.repo bash: cd: /etc/yum.repo: No such file or directory [sher@localhost ~]$ cd /etc/yum.repos.d [sher@localhost yum.repos.d]$ ls dag.repo dag.repo.bk sl-contrib.repo sl.repo sl-rhaps.repo dag.repo~ flash.repo sl-errata.repo sl.repo.bk [sher@localhost yum.repos.d]$ ls -l total 72 -rw-r--r-- 1 root root 113 Jun 23 10:56 dag.repo -rw-r--r-- 1 root root 113 Apr 20 09:27 dag.repo~ -rw-r--r-- 1 root root 113 Apr 20 09:27 dag.repo.bk -rw-r--r-- 1 root root 212 Apr 20 09:27 flash.repo -rw-r--r-- 1 root root 127 Apr 20 09:27 sl-contrib.repo -rw-r--r-- 1 root root 128 Apr 20 09:27 sl-errata.repo -rw-r--r-- 1 root root 119 Apr 20 09:27 sl.repo -rw-r--r-- 1 root root 119 Apr 20 09:27 sl.repo.bk -rw-r--r-- 1 root root 131 Apr 20 09:27 sl-rhaps.repo [sher@localhost yum.repos.d]$ cat dag.repo [dag] name=DAG rpms baseurl=ftp://ftp.scientificlinux.org/linux/extra/dag/redhat/el4/en/$basearch/dag/ enabled=1 [sher@localhost yum.repos.d]$ [sher@localhost yum.repos.d]$ yum list available Setting up Repos Reading repository metadata in from local files dag : ################################################## 2480/2480 MD Read : ################################################## 1447/1447 sl-base : ################################################## 1447/1447 Error: Caching enabled but no local cache of //var/cache/yum/sl-errata/primary.xml.gz from sl-errata [sher@localhost yum.repos.d]$ I have one other question, please: does it matter which yum repository one uses? Is this something that each distro decides for itself. In other words, should I stick to my distro's repository? What are your suggestions? Please remember that I am an ordinary user. Thank you so much. Benjamin