modifier le fichier /etc/apt/sources.list

=================
DEBIAN 9 STRETCH
=================

deb http://192.168.1.19/debian/ stretch main

deb http://192.168.1.19/debian-security stretch/updates main

# stretch-updates, previously known as 'volatile'
deb http://192.168.1.19/debian/ stretch-updates main

--------------------------------------------
# backports debian 9 si besoin :
deb http://192.168.1.19/debian stretch-backports main

=================
DEBIAN 10 BUSTER
=================

deb http://192.168.1.19/debian/ buster main

deb http://192.168.1.19/debian-security buster/updates main

# buster-updates, previously known as 'volatile'
deb http://192.168.1.19/debian/ buster-updates main

--------------------------------------------
# backports si besoin :
deb http://192.168.1.19/debian buster-backports main


===================
DEBIAN 11 BULLSEYE
===================

deb http://192.168.1.19/debian/ bullseye main

deb http://192.168.1.19/debian-security bullseye-security main

# buster-updates, previously known as 'volatile'
deb http://192.168.1.19/debian/ bullseye-updates main

--------------------------------------------
# backports si besoin :
deb http://192.168.1.19/debian bullseye-backports main


===================
DEBIAN 12 BOOKWORM
===================

deb http://192.168.1.19/debian bookworm main contrib non-free non-free-firmware
deb http://192.168.1.19/debian-security bookworm-security main contrib non-free non-free-firmware
deb http://192.168.1.19/debian bookworm-updates main contrib non-free non-free-firmware