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Open-source Linux OS from Canonical for desktops, servers, cloud and IoT. Free LTS releases with optional Ubuntu Pro for extended security, used by developers and enterprises.

Community-driven open-source Linux distro sponsored by Red Hat, focused on innovation. Offers Workstation, Server, Cloud, CoreOS and IoT editions for developers and users who want the latest software.

Completely free open-source OS maintained by a global volunteer community. Known for stability, vast package selection and strict free-software standards, used on servers, desktops and as a base for other distros.