参考
https://portal.databasemart.com/kb/a457/how-to-install-desktop-environment-and-xrdp-service-in-debian-9.aspx
1. 确保已经安装桌面系统
如果没有安装，运行下面安装，安装完重启。
tasksel
2. 安装XRDP TigerVNC
apt-get install xrdp tigervnc-standalone-server
3. 启动XRDP
systemctl start xrdp
systemctl enable xrdp