this post was submitted on 22 Nov 2024
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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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How does that work, exactly? I don't actually know. Are they compiling their own copies of the upstream code changes?
Yes, they're taking the source code from upstream, modifying ("patching") it, compiling it, then uploading their compiled binaries to the Ubuntu repo where your system downloads them during an update.
You can technically download the source code as well, if you activate the source repo. But hardly any end user does. And the source code you get doesn't compile to the same binary you get from the repo anyway. (This would be called a "reproducible build". Some distros try to be reproducible. Ubuntu doesn't, they have other priorities.)
Thank you. That makes sense why some downstream distros designed for specific purposes (e.g. gaming) might include a handful of their own repos for specific software.