Probleme d installation Ligne 727f

Atteint :4 Index of /debian/ bookworm-proposed-updates InRelease
Err :5 Index of /debian/ bookworm-security Release
404 Not Found [IP : 2a01:e0c:1:1598::2 80]
Lecture des listes de paquets…
E: Le dépôt Index of /debian/ bookworm-security Release n’a pas de fichier Release.
2024-11-02 17:25:15 - ****** INSTALLATION FAILED *****
2024-11-02 17:25:15 - Installation failed at step Making sure installation is sane. Please check log /var/log/pbx/freepbx17-install-2024.11.02-17.24.51.log for details.
2024-11-02 17:25:15 - Error at line: 727 exiting with code 100 (last command was: apt-get update >> $log)
2024-11-02 17:25:15 - Exiting script

Bonjour,
Comment puis je passer cette etape…
merci de votre aide
Pierre