Tutorial for installing VNC Server on Ubuntu 20.04.

The following is a tutorial for installing a VNC server (VNC Server) on Ubuntu 20.04:

1. Update system:

   sudo apt update
   sudo apt upgrade

2. Install the Xfce desktop environment:

   sudo apt install xfce4 xfce4-goodies

3. Install TightVNC server:

   sudo apt install tightvncserver

4. Start the VNC server and set the access password:

   vncserver

   When you run vncserver for the first time, you will be asked to set an access password and confirm the password.

5. Stop the VNC server:

   vncserver -kill :1

   Note that ":1" is the identifier for the display, if you set a different display number you should change accordingly.

6. Configure the VNC server:

   cd ~/.vnc
   mv xstartup xstartup.bak
   touch xstartup
   chmod +x xstartup
   nano xstartup

   Open the xstartup file in an editor and copy paste the following into the file:

   #!/bin/bash
   xrdb $HOME/.Xresources
   startxfce4 &

7. Restart the VNC server:

   vncserver

8. Configure the firewall:

   sudo ufw allow 5901

   This will allow connections to port 5901 via VNC.

You should now be able to connect to your Ubuntu 20.04 server via a VNC client. Make sure to specify the connection in the format used in the VNC client  <IP地址>:5901. Then enter the VNC access password you set earlier.

Note that VNC connections transmit data in clear text, so it is recommended to use VNC in a secure network environment and set a strong password to ensure security.

Hope this tutorial helps you!