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1. Open a terminal window on your Ubuntu machine.

2. Update the package list by running the following command:

sudo apt-get update

1. Install the PHP GD package by running the following command:

sudo apt-get install php-gd

1. After the installation is complete, restart the Apache web server by running the following command:

sudo systemctl restart apache2

1. Verify the installation by creating a simple PHP script that uses the GD library. For example, you can create a script called test.php with the following code:

1. Save the script in the /var/www/html directory and access it in a web browser by navigating to http://localhost/test.php. If the script displays a "Hello, world!" message in a PNG image, the installation was successful.