Previously, we have shown you how to install the VNC Server on CentOS (Click Here). Today we are going to cover the installation and configuration of the VNC Server on your Ubuntu machine.
Since VNC uses the client/server model, we need to deploy the VNC Server on an Ubuntu machine. To test the connection, we will use the VNC Client on a Windows machine.
Before starting the VNC Server installation, first you need to make sure that your Ubuntu is up-to-date using the following commands:
sudo apt update sudo apt upgrade
Installing VNC Server on Ubuntu
Step 1. For the VNC Server work correctly on your Ubuntu machine, we need to install a graphical desktop such as KDE, Gnome, XFCE, etc. For this tutorial, we will be using the XFCE desktop.
Use the following command to install the XFCE desktop package and other dependencies packages.
sudo apt install xfce4 xfce4-goodies
Step 2. Install the VNC Server package, there are many VNC Server packages, and we will be using the ‘tightvncserver’ one.
Use the following command to install the ‘tightvncserver’ package.
sudo apt install -y tightvncserver
Step 3. Now, let’s start the VNC server using the following command.
You will be asked to create a VNC server password, type and verify the password as you can see in the below screenshot.
Step 4. Once you run the VNC server command, it will generate a VNC configuration directory located in your home directory. This VNC directory contains a VNC configuration file called ‘xstartup’ for the user who executed the command.
You can list the contents of the VNC configuration directory using the following command.
ls -lah ~/.vnc/
Step 5. To check if the VNC server process is running.
ps -ef | grep Xtightvnc
Configure VNC Server On Ubuntu
Step 1. Before starting in configuring the VNC server, we need first to stop the currently running session.
vncserver -kill :1
Step 2. Backup the default VNC server configuration file.
mv ~/.vnc/xstartup ~/.vnc/xstartup.backup_file
Step 3. Create a new VNC server configuration file.
Step 4. Edit the new configuration file and add the below lines:
#!/bin/bash xrdb $HOME/.Xresources startxfce4 &
Step 5. Set permissions on the new configuration file to be executable.
chmod +x ~/.vnc/xstartup
Step 6. Run the VNC server command.
Configure VNC Server Service
Next, we are going to configure the VNC server to run as a system service. And to do so, we need to create a new VNC server service file.
Step 1. Create a VNC service file.
sudo vi /etc/systemd/system/vncserver@.service
Step 2. Add the below lines to the VNC service file.
[Unit] Description=Remote desktop service (VNC) After=syslog.target network.target [Service] Type=forking User=<user_name> PIDFile=/home/<user_name>/.vnc/%H:%i.pid ExecStartPre=-/usr/bin/vncserver -kill :%i > /dev/null 2>&1 ExecStart=/usr/bin/vncserver -depth 24 -geometry 1280x800 :%i ExecStop=/usr/bin/vncserver -kill :%i [Install] WantedBy=multi-user.target
But do not forget to replace each <user_name> tag with your username like the below screenshot.
Step 3. Reload the systemd services daemon for changes to take effect.
sudo systemctl daemon-reload
Step 4. Start the VNC server service.
sudo systemctl start email@example.com
Step 5. Enable the VNC server service to start automatically with the system startup.
sudo systemctl enable firstname.lastname@example.org
Step 6. Finally, check the VNC server service status to make sure that everything is running normally with no errors.
sudo systemctl status email@example.com
Now you have the VNC server installed, and its session is up and running.
Step 7. Get your VNC Server IP that will be used in the next section.
If the previous command did not work, you could download the net-tools first then use the ifconfig command.
sudo apt install net-tools
Test The VNC Server Connection From Windows
In this part of the tutorial, we will test the VNC server by trying to connect from a VNC client on a windows machine.
Since the VNC protocol is not encrypted, it will be exposed to packet sniffing. So it is highly recommended to create an SSH tunnel that will safely and securely forwards all your local machine. In this case, is the VNC client machine traffic on port 5901 to the VNC server on the same 5901 port.
Step 1. To set up the SSH tunneling on Windows, you need to have the PUTTY client. Open Putty and enter your VNC server IP in the hostname filed like the below screenshot.
Step 2. From the left panel –> Under Connection Menu–> Open SSH –> Press Tunnels.
Enter the port number in the Source port field and vnc_server_ip:port_number in the Destination field. Then press the Add button as the below screenshot.
Next, you can go back to the session page to save the previous settings. You will not need to perform the previous steps every time you will open the VNC server. Finally, press Open to establish a connection to the VNC server.
Step 3. Putty will ask you for the username and password of your Ubuntu machine.
After you login you will get a screen like the below one:
By that, you have established an SSH tunnel now move on to the next step.
Step 4. Now open your VNC viewer and connect to the VNC server at localhost:5901.
You can skip the encryption warning.
You will be required to enter your VNC server password.
Finally, you will be able to see your Ubuntu desktop.
Congratulations you have just connected to your Ubuntu machine remotely.