On 24/10/2023 06:53, Jeffrey Walton wrote:
$ grep -iIR -E 'bookworm|bullseye|buster|stretch|jessie' /etc/aptmay 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.