First of all you should check the vncsever is running with. However, this connection from the client to the server is not secure, and the password sent to the server is sent as plain text over an unsecure channel. Once you've installed Ubuntu Server you will need a mechanism to be able to administer it. Every VNC server has different strengths and weaknesses and is appropriate for different uses. Common commands for Raspberry Pi OS (previously called Raspbian) Jessie (which is based on Debian 8, and uses systemd) are: To start VNC Server now: sudo systemctl start vncserver-x11-serviced. This page will discuss each of the VNC servers available in Ubuntu, and ways to configure. Configure PuTTY on the remote PC and begin tunnelling. By using the SSH tunnel, the VNC connection to your Ubuntu 20. Then you must check the listening 5900 port with. How to start vnc server from putty Instead of connecting directly to the Linux server, specify the host as 'localhost'.