Upgrading Fedora using package manager - Fedora Project Wiki
fedoraproject.org
上記Webサイトに記載されたママですが。
引用元：Upgrading Fedora using yum – FedoraProject
1. Install the new Fedora 18 gpg key: su -c ‘rpm –import https://fedoraproject.org/static/DE7F38BD.txt’
2. Set SELinux to Permissive mode: su -c ‘setenforce Permissive’
3. Upgrade all packages:
1. su -c ‘yum update yum’
2. su -c ‘yum clean all’
3. su -c ‘yum –releasever=18 –disableplugin=presto distro-sync’
4. Rebuild rpm database: su -c ‘rpm –rebuilddb’, or rpm -qa will not work due to an upgrade of rpm