ubuntu18.04

deb http://mirrors.xjtu.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.xjtu.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.xjtu.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.xjtu.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.xjtu.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.xjtu.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb http://mirrors.xjtu.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.xjtu.edu.cn/ubuntu/ bionic-security main restricted universe multiverse

　　

ubuntu16.04

deb http://mirrors.xjtu.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.xjtu.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.xjtu.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.xjtu.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.xjtu.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.xjtu.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb http://mirrors.xjtu.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.xjtu.edu.cn/ubuntu/ xenial-security main restricted universe multiverse