Make Debian Fun Again And Learn How To Do Other Cool Stuff Too

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If you edited your /etc/apt/sources.list this is the default. Some sources can also be under /etc/apt/sources.list.d/

Sources.list example:

deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware

deb http://deb.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware

deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware

If you want to also download from another mirror at the exact same time so you get concurrent downloads, you can add a mirror (security mirrors usually dont work for testing) but on a stable release it would be like this:

#Mirror
deb http://ftp.us.debian.org/debian bookworm main contrib non-free non-free-firmware
deb http://ftp.us.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware
deb http://ftp.us.debian.org/debian bookworm-updates main contrib non-free non-free-firmware

A complete file would be like this :

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

# deb http://deb.debian.org/debian/ bookworm-backports main contrib non-free

deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware

deb http://deb.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware

deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware

#Mirror
deb http://ftp.us.debian.org/debian bookworm main contrib non-free non-free-firmware
deb http://ftp.us.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware
deb http://ftp.us.debian.org/debian bookworm-updates main contrib non-free non-free-firmware

The mirror section is not required and not advised to add unless you know what you are doing. Just putting it out there if you want to test and learn more (which is why we are all here).