更换国内源
系统默认的apt源是国外的，下载软件速度慢，python的pip源也很慢，我们都换成阿里云的源。
更换apt源：
cd /etc/apt/sudo
cp sources.list sources.list.bak && sudo vim sources.list删除其中所有内容(dG)，替换成：
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse然后更新
sudo apt update
sudo apt upgrade更换pip源
安装pip并设置成默认
sudo apt install python3-pip
sudo ln -s /usr/bin/python3 /usr/bin/python
sudo ln -s /usr/bin/pip3 /usr/bin/pip修改pip源：
mkdir ~/.pip && vi ~/.pip/pip.conf在打开的vim中输入下文并保存：
[global]
index-url = http://mirrors.aliyun.com/pypi/simple/
[install]
trusted-host = mirrors.aliyun.com准备Hexo环境
安装nodejs及npm
sudo apt update
sudo apt install nodejs
sudo apt install npm配置npm
npm config set registry https://registry.npm.taobao.org
npm config get registry // 配置后可通过该命令来验证是否成功安装hexo
npm install hexo-cli -g