Ubuntu 16.04(xenial) 国内数据源: 阿里云

删除/etc/apt/sources.list全部内容,添加阿里数据源:

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

更新:

hjj@ubuntu:/$ sudo apt-get update

来源：https://my.oschina.net/u/4063061/blog/3111075