学校内有Ubuntu服务器使用需求，而且不能连接互联网，导致安装软件和更新都比较麻烦，需要建立一台本地更新源服务器。
Server端
一、安装ssh server
目的：使Ubuntu服务器可以通过外网进行ssh登录
sudo apt install openssh-server
二、设置国内镜像源
这里选用了中科大的镜像源：https://mirrors.ustc.edu.cn/repogen/
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
## Not recommended
# deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
接下来更新源
sudo apt update
二、为Ubuntu服务器配置远程桌面
Ubuntu 16.04 + xRDP + Xfce 实现Windows远程桌面连接
1. 安装xRDP及vncserver
sudo apt-get install xrdp
sudo apt-get install vnc4server tightvncserver
2. 安装Xfce桌面环境
sudo apt-get install xubuntu-desktop
3. 设置xRDP
echo xfce4-session >~/.xsession
4. 设置配置文件
sudo vi /etc/xrdp/startwm.sh
在. /etc/X11/Xsession 前一行插入
xfce4-session
5. 重启 xrdp
sudo service xrdp restart
6. 最后测试远程链接
Microsoft Remote Desktop
三、安装apt-mirror
1. 安装apt-mirror
sudo apt install -y apt-mirror
2. 配置apt-mirror
sudo vi /etc/apt/mirror.list
set base_path /opt/source
set nthreads 20
set _tilde 0
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
## Not recommended
# deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
# 清除无用的安装包，节省磁盘空间
clean https://mirrors.ustc.edu.cn/ubuntu/
四、同步源
1. 创建postmirror.sh文件，否则会报类似can't open /opt/source/var/postmirror.sh错误
该文件用于执行同步软件源成功后所执行的操作；
touch /opt/source/var/postmirror.sh
sudo apt-mirror
五、安装Apache
1. 安装apache2
apt install -y apache2
2. 创建软链接
ln -s /opt/source/mirror/mirrors.ustc.edu.cn/ubuntu /var/www/html/ubuntu
六、设置定时任务，定时同步软件源
利用crontab设置定时任务
crontab -e
0 2 * * * /usr/bin/apt-mirror > /opt/source/var/cron.log &
Client端
一、修改软件源
vim /etc/apt/source.list
deb http://59.64.81.180:80/ubuntu/ xenial main restricted universe multiverse
deb http://59.64.81.180:80/ubuntu/ xenial-updates main restricted universe multiverse
deb http://59.64.81.180:80/ubuntu/ xenial-security main restricted universe multiverse
deb http://59.64.81.180:80/ubuntu/ xenial-backports main restricted universe multiverse
deb http://59.64.81.180:80/openstack/ xenial-updates/mitaka main
二、更新软件源
apt update
本文转载自：https://www.xiaocoder.com/2017/06/03/apt-mirror/
在此基础上，做了一些编辑和改动