阿里云开源镜像网址: http://mirrors.aliyun.com/ 清华大学开源软件镜像站: https://mirrors.tuna.tsinghua.edu.cn/ CentOs: Aliyun: http://mirrors.aliyun.com/centos/7.4.1708/isos/x86_64/ Ubuntu: 清华镜像:https://mirrors.tuna.tsinghua.edu.cn/ubuntu-cdimage/lubuntu/releases/16.04.3/release/lubuntu-16.04-alternate-amd64.iso