http://www.cnblogs.com/bovenson/p/5752213.html

# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted deb-src

http://archive.ubuntu.com/ubuntu xenial main restricted

http://archive.canonical.com/ubuntu xenial partner deb-src

http://archive.canonical.com/ubuntu xenial partner deb

http://mirrors.aliyun.com/ubuntu/ xenial main restricted deb-src

http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe

http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted deb-src

http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe

http://mirrors.aliyun.com/ubuntu/ xenial universe deb

http://mirrors.aliyun.com/ubuntu/ xenial-updates universe deb

http://mirrors.aliyun.com/ubuntu/ xenial multiverse deb

http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse deb

http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src

http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse

http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted deb-src

http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe

http://mirrors.aliyun.com/ubuntu/ xenial-security universe deb

http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse