Список репозиториев debian 12
Прописываем в  /etc/apt/sources.list (плохая практика)
Лучше создайте файл в /etc/apt/sources.list.d/debian.list


<code>
# From https://wiki.debian.org/SourcesList
#
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
</code>

Устанавливаем ключики 
<code>
sudo apt install debian-archive-keyring
</code>

Обновляем кеш пакетов.

<code>
sudo apt update
</code>