On 24/10/2023 06:53, Jeffrey Walton wrote:
$ grep -iIR -E 'bookworm|bullseye|buster|stretch|jessie' /etc/apt
may list additional suspects, especially if they are hidden away in
/etc/apt/sources.list.d.
I would prefer either
apt policy
or
apt-cache policy
to get list of configured repositories as it is seen by apt.