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Xrdp is an open-source implementation of the Microsoft Remote Desktop Protocol (RDP) that allows you to graphically control a remote system. With RDP, you can log in to the remote machine and create a real desktop session the same as if you had logged in to a local machine.

This tutorial explains how to install and configure Xrdp server on Ubuntu 18.04.
If you want an open-source solution for remote desktop access, go with VNC.

Installing Desktop Environment

Generally, Linux servers don’t have a desktop environment installed. Our first step is to install X11 and a lightweight desktop environment that will act as a backend for Xrdp.
There are several desktop environments (DE) available in Ubuntu repositories. We’ll be installing Xfce. It is a fast, stable, and lightweight desktop environment, which makes it ideal for usage on a remote server.
Type the following commands as a user with sudo privileges to install Xfce on your server:
sudo apt updatesudo apt install xfce4 xfce4-goodies xorg dbus-x11 x11-xserver-utils
Depending on your system, downloading and installing Xfce packages will take some time.

Installing Xrdp

Xrdp package is available in the default Ubuntu repositories. To install it, run:
sudo apt install xrdp
When the installation process is complete, the Xrdp service will automatically start. You can verify that Xrdp is running by typing:
sudo systemctl status xrdp
The output will look something like this:
● xrdp.service - xrdp daemon
   Loaded: loaded (/lib/systemd/system/xrdp.service; enabled; vendor preset: enabled)
   Active: active (running) since Sun 2019-07-28 22:40:53 UTC; 4min 21s ago
     Docs: man:xrdp(8)
           man:xrdp.ini(5)
  ...
By default Xrdp uses the /etc/ssl/private/ssl-cert-snakeoil.key file which is readable only by users that are members of the “ssl-cert” group. Execute the following command to add the xrdp user to the group:
sudo adduser xrdp ssl-cert
That’s it. Xrdp has been installed on your Ubuntu server.

Configuring Xrdp

The Xrdp configuration files are located in the /etc/xrdp directory. For basic Xrdp connections, you do not need to make any changes to the configuration files. Xrdp uses the default X Window desktop, which in this case, is XFCE.
The main configuration file is named xrdp.ini. This file is divided into sections and allows you to set global configuration settings such as security and listening addresses and create different xrdp login sessions.
Whenever you make any changes to the configuration file you need to restart the Xrdp service:
sudo systemctl restart xrdp
Xrdp uses startwm.sh file to launch the X session. If you want to use another X Window desktop, edit this file.

Configuring Firewall

By default, Xrdp listens on port 3389 on all interfaces. If you run a firewall on your Ubuntu server (which you should always do), you’ll need to add a rule that will enable traffic on the Xrdp port.
To allow access to the Xrdp server from a specific IP address or IP range, in this example 192.168.1.0/24, run the following command:
sudo ufw allow from 192.168.1.0/24 to any port 3389
If you want to allow access from anywhere (which is highly discouraged for security reasons) run:
sudo ufw allow 3389
For increased security, you may consider setting up Xrdp to listen only on localhost and creating an SSH tunnel that securely forwards traffic from your local machine on port 3389 to the server on the same port. Another secure option is to install OpenVPN and connect to the Xrdp server trough the private network.

Khởi động lại xRDP
Các bạn chạy lệnh

Code: 
sudo service xrdp restart
Mặc định thì bạn đã đăng nhập với tên đăng nhập với tên đăng nhập là root nhưng bạn hoàn toàn có thể tự tạo tên đăng nhập khác
Tạo và xóa tên đăng nhập
Bạn chạy lệnh sau để tạo tên đăng nhập
Code: 
sudo adduser tuoitreit
Với tuoitreit là tên đăng nhập bạn muốn tạo
Nhập vào mật khẩu

Để xóa tên đăng nhập vừa tạo bạn chạy lệnh sau


Code: 
sudo userdel -r tuoitreit
Với tuoitreit là tên đăng nhập bạn đã tạo và muốn xóa
Khi được hỏi Is the information correct? [Y/n] (nghĩa là thông tin trên là chính xác phải không?) thì bạn chọn Y

Fix lỗi no-sandbox vô thư mục /opt/google/chrome edit file google-chrome
sửa dong cuối cùng thêm sau đuôi

#exec -a "$0" "$HERE/chrome" "$@"
exec -a "$0" "$HERE/chrome" "$@" --user-data-dir --no-sandbox
chú ý đoạn bôi đen

Connecting to the Xrdp Server

Now that you have set up your Xrdp server, it is time to open your Xrdp client and connect to the server.
If you have a Windows PC, you can use the default RDP client. Type “remote” in the Windows search bar and click on “Remote Desktop Connection”. This will open up the RDP client. In the “Computer” field, enter the remote server IP address and click “Connect”.


On the login screen, enter your username and password and click “OK”.


Once logged in, you should see the default Xfce desktop. It should look something like this:


You can now start interacting with the remote XFCE desktop from your local machine using your keyboard and mouse.
If you are using macOS, you can install the Microsoft Remote Desktop application from the Mac App Store. Linux users can use an RDP client such as Remmina or Vinagre.

Conclusion

Installing an Xrdp server allows you to manage your Ubuntu 18.04 server from your local desktop machine through an easy to use graphic interface.
If you have questions, feel free to leave a comment below.