编辑 /etc/apt/source.list
# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial universe deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates universe deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial multiverse deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates multiverse deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security universe deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security multiverse deb-src [arch=amd64,i386] http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial main restricted deb-src [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted deb-src [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial universe deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-updates universe deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial multiverse deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties deb [arch=amd64,i386] http://archive.canonical.com/ubuntu xenial partner deb-src [arch=amd64,i386] http://archive.canonical.com/ubuntu xenial partner deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted deb-src [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-security universe deb [arch=amd64,i386] http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse
# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial universe deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates universe deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial multiverse deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates multiverse deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security universe deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security multiverse