https://mirrors.aliyun.com/ubuntu-releases/ https://mirrors.ustc.edu.cn/ubuntu-releases/ https://mirrors.tuna.tsinghua.edu.cn/ubuntu-releases/ https://mirrors.zju.edu.cn/ubuntu-releases/ https://ftp.sjtu.edu.cn/ubuntu-cd/ https://mirrors.neusoft.edu.cn/ubuntu-releases/ http://mirrors.163.com/ubuntu-releases/

猪厂(163) 的镜像服务器是唯一不支持 Https 的……