If you see that a Yum repository is listed more than once on a Red Hat, Fedora, or CentOS system, it is possible that the repository has been configured multiple times in the system's configuration files. This can cause issues when using the "yum" package manager, as it may not be clear which repository should be used to resolve package dependencies or download packages.
To fix this issue, you will need to locate and remove the duplicate repository configuration. Here are the steps you can follow:
List the available Yum repositories using the "yum repolist" command. This will show you all of the configured repositories and their names.
Identify the duplicate repository. Look for repositories that have the same name or URL.
Locate the configuration files for the duplicate repository. The repository configuration files are typically located in the "/etc/yum.repos.d" directory.
Remove the duplicate repository configuration from the configuration files. You can either delete the configuration file for the duplicate repository, or remove the duplicate repository configuration from the file.
Run the "yum clean all" command to clear the Yum cache and reload the repository configuration.
Check the available repositories again using the "yum repolist" command to confirm that the duplicate repository has been removed.
Keep in mind that removing a repository may cause issues if you are using packages from that repository. You should carefully consider the impact of removing a repository before doing so. If you are unsure about how to proceed, you may want to seek guidance from a system administrator or the Red Hat, Fedora, or CentOS community.