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Yes, Ubuntu Is Withholding Security Patches for Some Software
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From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Ubuntu and Debian are essentially the same here.
Debian's
contrib
repo, which is the equivalent of Ubuntu'suniverse
repo, doesn't get security updates from the Debian security team, as it's not considered an official part of Debian. Package maintianers have to provide security updates. https://www.debian.org/security/faq#contribThe difference is that Ubuntu provide paid support for contrib packages, including patches. Debian doesn't have any official paid support options.