Regular Updates
Ubuntu provides regular security updates to help users protect their systems from vulnerabilities promptly. This ensures that any newly discovered threats are addressed quickly.
AppArmor
Ubuntu includes AppArmor, a security module that offers mandatory access controls to enhance system security by confining programs to a limited set of resources.
Long-term Support (LTS)
LTS versions of Ubuntu receive security updates for five years, which ensures a stable and secure environment for businesses and servers.
Strong Community Support
A large and active community contributes to quick identification and remediation of security issues, as well as extensive documentation and forums for assistance.
Built-in Firewall
Ubuntu comes with a built-in firewall (UFW - Uncomplicated Firewall) providing a user-friendly interface for managing network security.
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From TFA: > Ubuntu Pro expands security coverage for critical, high and medium Common Vulnerabilities and Exposures (CVEs) to thousands of applications and toolchains, including Ansible, Apache Tomcat, Apache Zookeeper, Docker, Drupal, Nagios, Node.js, phpMyAdmin, Puppet, PowerDNS, Python 2, Redis, Rust, WordPress, and more. So sounds like coverage of a bunch of stuff in their Universe repository that is not part... - Source: Hacker News / over 2 years ago
Sorry to burst your bubble but Ubuntu has automatic security updates by default since 2016. It is also very easily configurable either to disable it outright or even make all updates automatically download and/or install. This is the update settings dialog and you can confirm automatic updates on the Ubuntu page on security if you scroll down a bit. I remember being a lot of noise when this was introduced because... Source: about 3 years ago
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