Install VNC Server - TightVNC

VNC: Virtual Network Computing
Let's follow the directions provided by Digital Ocean:
https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-vnc-on-ubuntu-18-04

On your server, begin by updating your list of packages:

$ sudo apt-get update

Install the lightweight Xfce desktop environment, along with some "goodies"

$ sudo apt-get install xfce4 xfce4-goodies

Once the desktop environment is in place, install the TightVNC service:

$ sudo apt-get install tightvncserver

Run the following to create the password(s) and configuration files for your VNC service:
Password must be between six and eight characters in length.
Passwords longer than eight characters will be truncated.
At this time, you can also create a "View Only" password.

$ vncserver

We will now configure the VNC service, but first, we must stop the service:

$ vncserver -kill :1

We are going to be modifying the xstartup file. Before doing that, rename the original file:

$ mv ~/.vnc/xstartup ~/.vnc/xstartup.bak

Create a new xstartup file

$ sudo nano ~/.vnc/xstartup

Commands in this file are executed whenver you start or restart the VNC serice. We need VNC to start our desktop environment if it isn't already started. Add the following commands to the xstartup file:

#!/bin/sh
xrdb $HOME/.Xresources
xsetroot -solid grey
#x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#x-window-manager &
startxfce4 &

Make sure the file has execute permission

$ sudo chmod +x ~/.vnc/xstartup

Now, restart the VNC service:

$ vncserver