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this post was submitted on 20 Sep 2023
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Linux
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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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Correct. They regularly freeze and maintain their own kernel, merging patches in as needed.
5.15.0-83.94-generic
5.15.0 (mainline kennel version at the point it was frozen)
83.94 (Canonical's version numbering with newer upstream patches merged in over time)
generic (Canonical maintains several specialized flavors of kernel for different needs)
They've recently put out a "HWE" flavor which just starts at a much newer point in the upstream kernel. I'm not sure what the point is in maintaining the 5.15 and the 6.2 flavors side-by-side.
Sources:
https://ubuntu.com/kernel
https://people.canonical.com/~kernel/info/kernel-version-map.html