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How to verify the integrity of a Linux distribution iso image

When we decide to install an operating system based on the Linux kernel, the first thing we do is to download its installation image, or ISO, from the official distribution website. Before proceeding with the actual installation, however, it is crucial to verify the integrity of the image, to be sure it is what it claims to be, and nobody has compromised it. In this tutorial we will see the basic steps we can follow to accomplish this task.