官方源还是最可靠的，虽然速度未必很快，总比 404 强
http://archives.fedoraproject.org/pub/archive/fedora/linux/updates/12/i386/
sudo vim fedora.repo 清空文件后，贴入以下官方源
[Fedora-fedoraproject.org] name=Fedora 12 – i386 baseurl=http://archives.fedoraproject.org/pub/archive/fedora/linux/updates/12/i386/ enabled=1 gpgcheck=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-Fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY
原文：https://www.cnblogs.com/Primzahl/p/10512547.html