IDC百科老版本系统下载地址
debian http://cdimage.debian.org/cdimage/archive/
centos http://vault.centos.org
ubuntu https://mirrors.bupt.edu.cn/ubuntu-releases/
老版本系统下载地址
debian http://cdimage.debian.org/cdimage/archive/
centos http://vault.centos.org
ubuntu https://mirrors.bupt.edu.cn/ubuntu-releases/