The error "Missing Dependency: xen-libs" when trying to update Linux using yum typically indicates that a package or application you are trying to install or update requires the xen-libs package, but it is not installed on your system.
To resolve this issue, you will need to install the xen-libs package. This can typically be done using the following command:
sudo yum install xen-libs
If this command fails, you may need to first enable the repository that contains the xen-libs package. You can do this by running the following command:
sudo yum-config-manager --enable repo-name
Replace "repo-name" with the name of the repository that contains the xen-libs package. You can use the yum repolist command to list the available repositories on your system.
Once the xen-libs package is installed, you should be able to update your system as usual using the yum update command. If you continue to encounter errors, you may need to seek assistance from a qualified technician or consult the documentation for your Linux distribution for more information.