Ubuntu

1. Ubuntu Server documentation

   Tutorials, how-to guides and explanations for Ubuntu Server.

2. Netplan

   YAML network configuration with renderers.

3. cloud-init

   First-boot instance initialization with user data.

4. Snap documentation

   Snap packaging, confinement and channels.

5. LXD

   System containers and virtual machines managed through lxc commands and profiles.

6. Ubuntu Pro client

   Enabling ESM, Livepatch and compliance services with the pro command.

7. Ubuntu Core

   Snap-based IoT operating system.

8. Ubuntu manpages

   Rendered man pages for every Ubuntu release.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Source: endoflife.date