Error "unknown command" on page https://wiki.debian.org/fr/unattended-upgrades

["christophedoumenc@free.fr (IMAP)" <christophedoumenc@free.fr>]

Hi,

On chap 1.1 
(https://wiki.debian.org/fr/unattended-upgrades#Appel_automatique_avec_.2Fetc.2Fapt.2Fapt.conf.d.2F20auto-upgrades), 
using Debian 11 TerminalEmulator I get the following error :
    root@D630:/home/christophe# dpkg-reconfigure -plow unattended-upgrades
    bash: dpkg-reconfigure : commande introuvable

Maybe package dpkg-reconfigure should be explained how to be installed 
unless another method is recommended for Bullseye ?

Regards,
Christophe