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.
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.
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.