Ubuntu provides and a GPG signature . On Windows, macOS, or Linux, you can check the checksum:
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In this post, I’ll walk you through exactly what an ISO is, where to download the right one, and how to turn that file into a bootable USB drive. An ISO file (or ISO image) is a complete, sector-by-sector copy of an optical disc (like a CD, DVD, or Blu-ray). In the context of operating systems, an ISO contains all the files needed to install or run Ubuntu. ubuntu linux iso