this post was submitted on 18 Aug 2025
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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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Not sure if this answers your question, on my fresh install of Debian 13 it seems to default to using
/etc/apt/sources.list
For example, I had to go in there to enable non-free and it worked fine.
There is a newer/recommended format of sources files ending in .sources in the same folder. The newer format is supported as of Debian 13 but for whatever reason Debian 13 doesn't actually default to installing the newer version on fresh installs. I'm a bit confused by that but Debian's own docs do discuss it.
https://wiki.debian.org/SourcesList
On my fresh install the /etc/apt/sources.list.d still exists, it looks like other software still create their own sources .list files in there when adding their own repos. Debian 13 itself does not seem to generate any files there.
I noticed that too.
I did it manually, deleted the old list file, it works fine.