diff --git a/tools/build_release.sh b/tools/build_release.sh
index 5052f92d0..93701ad9a 100644
--- a/tools/build_release.sh
+++ b/tools/build_release.sh
@@ -7,7 +7,7 @@ die() {
 }
 
 PACKAGE_NAME=scodoc9
-RELEASE_TAG=9.0.0
+RELEASE_TAG=9.0.0-b
 VERSION=9.0.0
 RELEASE=1
 ARCH="amd64"
@@ -52,6 +52,17 @@ cp -p "$SCODOC_DIR"/tools/etc/scodoc9.service "$slash"/etc/systemd/system/ || di
 mv "$SCODOC_DIR"/tools/debian "$slash"/DEBIAN || die "can't install DEBIAN dir"
 chmod 755 "$slash"/DEBIAN/*inst || die "can't chmod debian scripts"
 
-
+# ------------ CREATION DU VIRTUALENV
+echo "Creating python3 virtualenv..."
+(cd $SCODOC_DIR && python3 -m venv venv) || die "error creating Python 3 virtualenv"
+
+# ------------ INSTALL DES PAQUETS PYTHON (3.9)
+# pip in our env, as user "scodoc"
+(cd $SCODOC_DIR && source venv/bin/activate && pip install wheel && pip install -r requirements-3.9.txt) || die "Error installing python packages"
+
+# -------- THE END
+echo "Terminé."
+echo "Après vérification, construire le paquet .deb avec:"
+echo "  dpkg-deb --build --root-owner-group $DEST_DIR"
 
 
diff --git a/tools/debian/postinst b/tools/debian/postinst
index 6a4d369d3..2c9254c47 100644
--- a/tools/debian/postinst
+++ b/tools/debian/postinst
@@ -9,7 +9,8 @@ source /opt/scodoc/tools/config.sh
 source /opt/scodoc/tools/utils.sh
 
 # -- Création au besoin de notre utilisateur
-adduser --system "${SCODOC_USER}"
+# adduser --system "${SCODOC_USER}"
+check_create_scodoc_user
 
 # -- Répertoires /opt/scodoc donné à scodoc
 change_scodoc_file_ownership
diff --git a/tools/debian/preinst b/tools/debian/preinst
index 178d36b32..571580d27 100644
--- a/tools/debian/preinst
+++ b/tools/debian/preinst
@@ -3,17 +3,23 @@
 # Pre-installation de scodoc
 
 # ------------ Safety checks
-# Version majeure de Debian (..., 9, 10)
-debian_version=$(cat /etc/debian_version)
-debian_version=${debian_version%%.*}
-if [ "${debian_version}" != "11" ]
-then
-   echo "Version du systeme Linux Debian incompatible"
-   exit 1
-fi
+# Version majeure de Debian (..., 9, 10, 11)
 
-if [ "$(arch)" != "x86_64" ]
-then
-   echo "Version du systeme Linux Debian incompatible (pas X86 64 bits)"
-   exit 1
+if [ -e /etc/debian_version ]
+then 
+    debian_version=$(cat /etc/debian_version)
+    debian_version=${debian_version%%.*}
+    echo "Detected Debian version: ${debian_version}"
+else
+    echo "can't detect Debian version"
 fi
+# 
+echo arch="$(arch)"
+
+# if [ "$(arch)" != "x86_64" ]
+# then
+#    echo
+#    echo "Version du systeme Linux Debian incompatible (pas X86 64 bits)"
+#    echo
+#    exit 1
+# fi
diff --git a/tools/install_debian11.sh b/tools/install_debian11.sh
index 0cb708476..70cc61fae 100755
--- a/tools/install_debian11.sh
+++ b/tools/install_debian11.sh
@@ -78,7 +78,7 @@ su -c "(cd $SCODOC_DIR && python3 -m venv venv)" scodoc || die "can't create Pyt
 
 # ------------ INSTALL DES PAQUETS PYTHON (3.9)
 # pip in our env, as user "scodoc"
-su -c "(cd $SCODOC_DIR && source venv/bin/activate && pip install wheel && pip install -r requirements-3.9.txt)" || die "Error installing python packages"
+su -c "(cd $SCODOC_DIR && source venv/bin/activate && pip install wheel && pip install -r requirements-3.9.txt)" scodoc || die "Error installing python packages"
 # pip install --upgrade pip => bug [Errno 39] Directory not empty: '_internal'
 
 # ------------
diff --git a/tools/utils.sh b/tools/utils.sh
index b481de211..e34cc5262 100644
--- a/tools/utils.sh
+++ b/tools/utils.sh
@@ -60,7 +60,6 @@ init_postgres_user() { # run as root
 }
 
 # --- Ensure Unix user "scodoc" exists
-# note: le paquet debian utilise directement adduser --system
 check_create_scodoc_user() {
     if ! id -u "${SCODOC_USER}" &> /dev/null
     then