第一步需要我们先SSH进Ubuntu
这里就不细嗦了……
第二步更改DNS（能让其上外网，因为后面要更换源）
(1) 命令：sudo vim /etc/resolv.conf
(2) 修改nameserver后的ip地址为：114.114.114.114 后保存退出！
(3) 重启网卡，命令：sudo /etc/init.d/network-manager restart
(4) Ping 一下www.baidu.com看一下是否能ping通，通的话就说明更改好了。
第三步更改源为 ubuntu18.04 (aarch64 + 清华源)
(1) 先备份一下原来的源
命令：sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
(2) 编辑源列表
命令：sudo vim /etc/apt/sources.list
(3) 清空掉原本的源
在命令行模式输入 :%d 如果下图，输入后点击回车即可清空
(4) 更换为aarch64 + 清华源
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-proposed main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-proposed main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main multiverse restricted universe
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
# # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
deb http://ports.ubuntu.com/ubuntu-ports/ bionic-security main restricted universe multiverse
# deb-src http://ports.ubuntu.com/ubuntu-ports/ bionic-security main restricted universe multiverse
复制上面内容，右键粘贴后，保存退出。
(5) 更新，命令：sudo apt-get update
安装Apache2
(1) 命令：apt install apache2
(2) 浏览器访问：ip 看是否会出现一下界面，出现则说明安装成功
安装PHP7.2
(1) 命令：
apt-get install php7.2 php7.2-fpm php7.2-cli php7.2-dev php7.2-redis php7.2-mysql php7.2-curl php7.2-xml php7.2-json php7.2-gd php7.2-mbstring php7.2-zip php7.2-bcmath -y
如图：
(2) 安装途中会出现下图中的选择时区环节：选择亚洲Asia , shanghai
(3) 安装好后可以通过php -v 命令查看是否成功安装上了
(4) 或者可以通过命令：php -m ，查看是否有需要的相关组件
将Apache与PHP关联
(1) 安装命令：apt install libapache2-mod-php 会有选项让输入y/n 输入y
(2) 重启Apache2 命令：sudo /etc/init.d/apache2 restart
测试是否安装正常
(1) 在var/www/html/新建一个 *.php文件
(2) 在内部编写php代码，例如：
在浏览器直接访问，当前文件，看是否能出现php的信息，如下图：则表示配置成功
