live-build: début catastrophique

[peterpan31 <peterpan31 AT free.fr>]

Bonjour,

Je fais des essais avec Debian live build pour adapter une iso netinst.

Le script auto/config est :
#!/bin/sh

lb config noauto \
    "${@}"

La commande dessous passe :
$ lb config

[2023-11-20 01:12:04] lb_config
P: Executing auto/config script.
[2023-11-20 01:12:04] lb_config noauto
P: Considering defaults defined in /etc/live/build.conf
P: Updating config tree for a debian/amd64 system

Mais la suivante plante :
$ sudo lb build

[2023-11-20 01:12:46] lb_build
P: Executing auto/build script.
[2023-11-20 01:12:46] lb_build noauto
[2023-11-20 01:12:46] lb_bootstrap
P: Setting up cleanup function
[2023-11-20 01:12:46] lb_bootstrap_cache restore
P: Restoring bootstrap stage from cache...
[2023-11-20 01:12:46] lb_bootstrap_copy
[2023-11-20 01:12:46] lb_bootstrap_cdebootstrap
[2023-11-20 01:12:46] lb_bootstrap_debootstrap
P: Begin bootstrapping system...
[2023-11-20 01:12:46] lb_testroot
P: If the following stage fails, the most likely cause of the problem is 
with your mirror configuration or a caching proxy.
P: Running debootstrap (download-only)...
W: Cannot check Release signature; keyring file not available 
/usr/share/keyrings/debian-archive-keyring.gpg
I: Retrieving InRelease
I: Retrieving Release
E: Failed getting release file http://mirror/debian/dists/wheezy/Release
P: Begin unmounting filesystems...
P: Saving caches...
chroot: failed to run command ‘/usr/bin/env’: No such file or directory

Note: avec des config plus complets "lb build" progressait beaucoup plus 
mais jamais l'iso n'aitait construite (j'ai eu des vouts d'iso).

Y a-t-il un expert pour m'aider sur ce beau sujet ?

pierre estrem