写在前面的话：
在docker中apt-get使用的是国外的源,速度是非常慢的，所以要更换为国内的源:
一、更改为163源：
1、原文件备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2、修改源（直接修改，未使用vi或者vim修改）
echo "">sources.list
echo "deb http://mirrors.163.com/ubuntu/ artful main restricted universe multiverse">>sources.list
echo "deb http://mirrors.163.com/ubuntu/ artful-security main restricted universe multiverse">>sources.list
echo "deb http://mirrors.163.com/ubuntu/ artful-updates main restricted universe multiverse">>sources.list
echo "deb http://mirrors.163.com/ubuntu/ artful-proposed main restricted universe multiverse">>sources.list
echo "deb http://mirrors.163.com/ubuntu/ artful-backports main restricted universe multiverse">>sources.list
echo "deb-src http://mirrors.163.com/ubuntu/ artful main restricted universe multiverse">>sources.list
echo "deb-src http://mirrors.163.com/ubuntu/ artful-security main restricted universe multiverse">>sources.list
echo "deb-src http://mirrors.163.com/ubuntu/ artful-updates main restricted universe multiverse">>sources.list
echo "deb-src http://mirrors.163.com/ubuntu/ artful-proposed main restricted universe multiverse">>sources.list
echo "deb-src http://mirrors.163.com/ubuntu/ artful-backports main restricted universe multiverse">>sources.list
或者进入编辑模式后使用
deb http://mirrors.163.com/ubuntu/ wily main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ wily-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ wily-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ wily-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ wily-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily-backports main restricted universe multiverse
二、更改为阿里源：
1、原文件备份
sudo mv /etc/apt/sources.list /etc/apt/source.list.bak
2、编辑源列表文件
sudo vim /etc/apt/sources.list
3、用下面的文本作为内容
ubuntu 14的版本
deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
ubuntu 16的版本
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 #测试版源 deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse #源码 deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #测试版源 deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse #Canonical 合作伙伴和附加 deb http://archive.canonical.com/ubuntu/ xenial partner deb http://extras.ubuntu.com/ubuntu/ xenial main
三、更改为中科大镜像源
1、原文件备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2、编辑源列表文件
sudo vim /etc/apt/sources.list
3、将原来的列表删除，添加如下内容（中科大镜像源）
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
备注：在更换软件源时若遇到了如下问题
Reading package lists... Done
E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/
表明当前有某个进程正在apt-get，然而我并没有使用任何命令，于是需要kill掉进程。
解决办法:
rm /var/lib/apt/lists/lock
