Install GUI and VNC for Ubuntu Server

Install GUI for Ubuntu Server
Install VNC Server
Install VNC Viewer (VNC Client)

1. Install GUI for Ubuntu Server

After being installed, Linux Servers have no user interface. In the post, I will show you the way to install XFCE4, this is a lightweight graphical user interface but it is friendly to the majority of users.

Note: In case I use PuTTY to connect it to Unbuntu Server and execute commands to install XFCE4. You can execute direct commands on Ubuntu Server.
You can see more about PuTTY here:
Install PuTTY on Windows

Open PuTTY and connect to Ubuntu Server.

We have direct XFCE installing packages from Unbuntu's Software Repositories.

Run command:

sudo apt-get update

Next, running the command to install XFCE:

sudo apt-get install xfce4 xfce4-goodies

If you get the "Unable to locate package xfce4" error message, you need to add universe repository to your system:
sudo add-apt-repository universe

sudo apt update

After being installed, XFCE will takes about 523MB, pressing Enter to confirm the installing

XFCE is being installed:

XFCE has been installed successfully.

2. Install VNC Server

Install VNC Server:

sudo apt-get install tightvncserver

Next, you need to run VNC Server on Ubuntu. Then, installing VNC Client to your computer to be able to talk with VNC-Server. At that time, you can work with Ubuntu Server having the XFCE graphical user interface.

Running command:

vncserver

If you get "Could not open default font 'fixed'" error message, please install xfonts-base on your system.
sudo apt-get install  xfonts-base
Restart Ubuntu Server.