重置root密码

sudo passwd root

#为了以后省去sudo输入密码。
sudo visudo
#在文件最后加上
用户名 ALL=(ALL) NOPASSWD: ALL

安装vim并设置主编辑器

apt install vim -y
select-editor

给vi起别名

echo "alias vi=vim" >> /etc/profile
source /etc/profile

修改apt的源

#先安装vim
sudo apt-get install vim -y
#好习惯，先备份原来的
cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo vim /etc/apt/sources.list

#把内容改成
 deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
 deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
 deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
 deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
 deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
 deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
 deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
 deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
 deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
 deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

更新软件列表

sudo apt update & apt upgrade

安装python

其实这里主要是因为python的一些版本问题。如果没有问题，可跳过

sudo apt install python3
sudo apt install python3-pip

安装ssh & xrdp & firewalld

sudo apt install ssh

sudo apt install xrdp

sudo systemctl status xrdp
sudo adduser xrdp ssl-cert  
sudo systemctl restart xrdp

sudo apt install firewalld