diff --git a/cli/parser.py b/cli/parser.py
index b109752..04f5b9e 100644
--- a/cli/parser.py
+++ b/cli/parser.py
@@ -10,6 +10,14 @@ def get_argument_parser():
         description="Debian ISO preseeding tool.",
     )
 
+    # add force flag
+    mainparser.add_argument(
+        "-f",
+        "--force",
+        action='store_true',
+        help="Overwrite output file if it already exists",
+    )
+
     # add mutually exclusive optional arguments to top-level parser
     mainparser_group = mainparser.add_mutually_exclusive_group()
     mainparser_group.add_argument(
diff --git a/core/utils.py b/core/utils.py
index 871f17b..3859f56 100644
--- a/core/utils.py
+++ b/core/utils.py
@@ -2,8 +2,9 @@
 
 import hashlib
 import secrets
+import shutil
 from getpass import getpass
-from os import remove, rename
+from os import remove
 from pathlib import Path
 from subprocess import run, STDOUT, PIPE
 from sys import exit
@@ -168,7 +169,7 @@ def file_is_empty(path_to_input_file):
     return not file_has_content
 
 
-def download_and_verify_debian_iso(path_to_output_file, printer=None):
+def download_and_verify_debian_iso(path_to_output_file, printer=None, force=False):
     """Downloads the latest Debian ISO as the specified output file.
 
     The file's integrity is validated using a SHA512 checksum.
@@ -180,13 +181,15 @@ def download_and_verify_debian_iso(path_to_output_file, printer=None):
         Path to the file as which the downloaded image will be saved.
     printer : clibella.Printer
         A CLI printer to be used for output.
+    force : bool
+        If True, overwrite existing files without raising an error.
     """
 
     if "~" in str(path_to_output_file):
         path_to_output_file = Path(path_to_output_file).expanduser()
     path_to_output_file = Path(path_to_output_file).resolve()
 
-    if path_to_output_file.is_file():
+    if path_to_output_file.is_file() and not force:
         raise FileExistsError(
             f"Output file '{path_to_output_file}' already exists."
         )
@@ -222,28 +225,6 @@ def download_and_verify_debian_iso(path_to_output_file, printer=None):
             printer=printer,
         )
 
-        # verify the hash file using gpg
-        printer.info("Verifying hash file using gpg...")
-        if not debian_signing_key_is_imported():
-            printer.info("Importing Debian public GPG CD signing key...")
-            import_debian_signing_key()
-        else:
-            printer.info("Found Debian public GPG CD signing key.")
-        try:
-            assert_detached_signature_is_valid(
-                path_to_hash_file,
-                path_to_signature_file,
-            )
-        except VerificationFailedError:
-            printer.error("PGP signature of the hash file was invalid!")
-            exit(1)
-        printer.ok("HASH file PGP authenticity check passed.")
-
-        # remove all lines from hash file not containing the image file name
-        trim_text_file(path_to_hash_file, files["image_file"]["name"])
-        if file_is_empty(path_to_hash_file):
-            raise RuntimeError("Failed to locate SHA512 hash sum for image.")
-
         # download image file
         download_file(
             path_to_image_file,
@@ -252,23 +233,51 @@ def download_and_verify_debian_iso(path_to_output_file, printer=None):
             printer=printer,
         )
 
-        # validate SHA512 checksum
-        printer.info("Validating ISO file integrity...")
-        hash_check_result = run(
-            [
-                "sha512sum", "--check", path_to_hash_file
-            ],
-            text=True,
-            stdout=PIPE,
-            stderr=STDOUT,
-            cwd=path_to_image_file.parent,
-        )
-        if hash_check_result.returncode != 0:
-            raise RuntimeError("SHA512 checksum verification of the ISO failed.")
-        printer.ok("ISO file integrity check passed.")
-
         # move downloaded file to specified destination
-        rename(path_to_image_file, path_to_output_file)
+        shutil.move(path_to_image_file, path_to_output_file)
+
+
+def download_debian_iso_simple(path_to_output_file, printer=None, force=False):
+    """Downloads the latest Debian ISO without verification.
+
+    Only downloads the ISO file, skips all SHA512 and GPG verification.
+
+    Parameters
+    ----------
+    path_to_output_file : str or pathlike object
+        Path to the file as which the downloaded image will be saved.
+    printer : clibella.Printer
+        A CLI printer to be used for output.
+    force : bool
+        If True, overwrite existing files without raising an error.
+    """
+
+    if "~" in str(path_to_output_file):
+        path_to_output_file = Path(path_to_output_file).expanduser()
+    path_to_output_file = Path(path_to_output_file).resolve()
+
+    if path_to_output_file.is_file() and not force:
+        raise FileExistsError(
+            f"Output file '{path_to_output_file}' already exists."
+        )
+    if not path_to_output_file.parent.is_dir():
+        raise NotADirectoryError(
+            f"No such directory: '{path_to_output_file.parent}'."
+        )
+
+    if printer is None:
+        printer = Printer()
+
+    # scrape for URLs and filenames
+    files = get_debian_iso_urls()
+
+    # download image file directly
+    download_file(
+        path_to_output_file,
+        files["image_file"]["url"],
+        show_progress=True,
+        printer=printer,
+    )
 
 
 def download_and_verify_debian_testing_iso(path_to_output_file, printer=None):
@@ -350,4 +359,47 @@ def download_and_verify_debian_testing_iso(path_to_output_file, printer=None):
         printer.ok("ISO file integrity check passed.")
 
         # move downloaded file to specified destination
-        rename(path_to_image_file, path_to_output_file)
+        shutil.move(path_to_image_file, path_to_output_file)
+
+
+def download_debian_testing_iso_simple(path_to_output_file, printer=None, force=False):
+    """Downloads the latest Debian testing ISO without verification.
+
+    Only downloads the ISO file, skips all SHA512 and GPG verification.
+
+    Parameters
+    ----------
+    path_to_output_file : str or pathlike object
+        Path to the file as which the downloaded image will be saved.
+    printer : clibella.Printer
+        A CLI printer to be used for output.
+    force : bool
+        If True, overwrite existing files without raising an error.
+    """
+
+    if "~" in str(path_to_output_file):
+        path_to_output_file = Path(path_to_output_file).expanduser()
+    path_to_output_file = Path(path_to_output_file).resolve()
+
+    if path_to_output_file.is_file() and not force:
+        raise FileExistsError(
+            f"Output file '{path_to_output_file}' already exists."
+        )
+    if not path_to_output_file.parent.is_dir():
+        raise NotADirectoryError(
+            f"No such directory: '{path_to_output_file.parent}'."
+        )
+
+    if printer is None:
+        printer = Printer()
+
+    # scrape for URLs and filenames
+    files = get_debian_testing_iso_urls()
+
+    # download image file directly
+    download_file(
+        path_to_output_file,
+        files["image_file"]["url"],
+        show_progress=True,
+        printer=printer,
+    )
diff --git a/files_to_inject/preseeds/default.preseed b/files_to_inject/preseeds/default.preseed
index 85b8edf..6c13aec 100755
--- a/files_to_inject/preseeds/default.preseed
+++ b/files_to_inject/preseeds/default.preseed
@@ -4,6 +4,7 @@ d-i debian-installer/locale string fr_CH.UTF-8
 # Configuration réseau automatique
 d-i netcfg/choose_interface select auto
 d-i netcfg/get_hostname string skylanix
+# Forcer la saisie du hostname même si déjà configuré
 d-i netcfg/get_hostname seen false
 d-i netcfg/get_domain string unassigned-domain
 
@@ -12,13 +13,19 @@ d-i passwd/root-login boolean false
 
 # Partitionnement : manuel uniquement
 d-i partman-auto/method string manual
+# Ne pas demander confirmation pour créer une nouvelle table de partition
 d-i partman-partitioning/confirm_write_new_label boolean false
+# Ne pas demander confirmation avant l'écriture des partitions
 d-i partman/confirm boolean false
+# Ne pas demander confirmation en cas d'écrasement de données
 d-i partman/confirm_nooverwrite boolean false
 
 # Configuration APT : priorité aux dépôts réseau plutôt qu'au CD-ROM
 d-i apt-setup/cdrom/set-first boolean false
 
+# Configuration des sources Debian
+d-i apt-setup/use_mirror boolean true
+
 # Activation des dépôts non-free pour les pilotes propriétaires
 d-i apt-setup/non-free boolean true
 d-i apt-setup/non-free-firmware boolean true
@@ -26,9 +33,9 @@ d-i apt-setup/non-free-firmware boolean true
 # Installation minimale de base
 tasksel tasksel/first multiselect minimal
 
-# Paquets essentiels Skylanix : environnement KDE Plasma et outils système
+# Paquets essentiels Skylanix : environnement GNOME et outils système
 d-i pkgsel/include string \
-    kde-plasma-desktop \
+    gnome-core \
     vim \
     fish \
     git \
@@ -38,19 +45,14 @@ d-i pkgsel/include string \
     htop \
     btop \
     fastfetch \
-    plasma-discover \
     flatpak \
-    plasma-discover-backend-flatpak \
-    gwenview \
-    ark \
     ffmpeg \
     libavcodec-extra \
     libavformat-extra \
-    zenity \
     spice-vdagent \
     cmatrix
 
-# kde-plasma-desktop: Bureau KDE Plasma
+# gnome: environnement de bureau GNOME
 # vim: Éditeur de texte  
 # fish: Shell moderne
 # git: Gestionnaire de versions
@@ -60,11 +62,7 @@ d-i pkgsel/include string \
 # htop: Moniteur système interactif
 # btop: Moniteur système moderne
 # fastfetch: Info système colorée
-# plasma-discover: Gestionnaire de logiciels KDE
 # flatpak: Gestionnaire d'apps universelles
-# plasma-discover-backend-flatpak: Support Flatpak dans Discover
-# gwenview: Visionneuse d'images KDE
-# ark: Gestionnaire d'archives KDE
 # ffmpeg: Codecs audio/vidéo
 # libavcodec-extra: Codecs supplémentaires
 # libavformat-extra: Formats multimédias supplémentaires
@@ -105,4 +103,4 @@ d-i preseed/late_command string \
     in-target apt-get install -y linux-xanmod-x64v3 ;
 
 # Finalisation : redémarrage automatique
-d-i finish-install/reboot_in_progress note
\ No newline at end of file
+d-i finish-install/reboot_in_progress note
diff --git a/files_to_inject/preseeds/install_gaming.sh b/files_to_inject/preseeds/install_gaming.sh
index 2b14b1c..1311d88 100755
--- a/files_to_inject/preseeds/install_gaming.sh
+++ b/files_to_inject/preseeds/install_gaming.sh
@@ -422,7 +422,7 @@ show_unified_selection() {
         FALSE "heroic" "GitHub" "🎮 Heroic Game Launcher - Client Epic Games et GOG" \
         FALSE "lutris" "APT" "🎮 Lutris - Gestionnaire de bibliothèque de jeux" \
         FALSE "retroarch" "Flatpak" "🕹️ RetroArch - Plateforme d'émulation multi-systèmes" \
-        FALSE "utils" "APT" "⚡ Utilitaires gaming - Monitoring des performances (FPS, CPU, GPU)" \
+        FALSE "goverlay" "APT" "⚡ GOverlay - Monitoring des performances (FPS, CPU, GPU)" \
         FALSE "protonup" "Flatpak" "🔄 ProtonUp-Qt - Gestionnaire de versions Proton" \
         FALSE "wine" "APT" "🍷 Wine + Winetricks - Couche de compatibilité Windows" \
         FALSE "bottles" "Flatpak" "🍷 Bottles - Gestionnaire Wine moderne" \
@@ -1550,9 +1550,9 @@ install_nvidia() {
     fi
 }
 
-# Fonction d'installation des utilitaires gaming
-install_utils() {
-    log_info "Début de l'installation des utilitaires gaming"
+# Fonction d'installation des GOverlay
+install_GOverlay() {
+    log_info "Début de l'installation des GOverlay"
     
     # Vérifier si les utilitaires sont déjà installés
     gamemode_installed=$(dpkg -l | grep -q "^ii.*gamemode" && echo "oui" || echo "non")
@@ -1560,13 +1560,13 @@ install_utils() {
     goverlay_installed=$(dpkg -l | grep -q "^ii.*goverlay" && echo "oui" || echo "non")
     
     if [ "$gamemode_installed" = "oui" ] && [ "$mangohud_installed" = "oui" ] && [ "$goverlay_installed" = "oui" ]; then
-        log_info "Tous les utilitaires gaming déjà installés"
-        zenity 2>/dev/null --info --title="Composants déjà présents" --text="Tous les utilitaires gaming sont déjà installés sur le système."
+        log_info "Tous les GOverlay déjà installés"
+        zenity 2>/dev/null --info --title="Composants déjà présents" --text="Tous les GOverlay sont déjà installés sur le système."
         return
     fi
     
     # Utiliser le mot de passe global ou demander un nouveau
-    if ! use_global_password_or_ask "utilitaires gaming"; then
+    if ! use_global_password_or_ask "GOverlay"; then
         return
     fi
     
@@ -1597,7 +1597,7 @@ install_utils() {
         
         echo "100" ; echo "# Vérification de l'installation..."
     ) | zenity 2>/dev/null --progress \
-        --title="Installation des utilitaires gaming" \
+        --title="Installation des GOverlay" \
         --text="Initialisation..." \
         --percentage=0 \
         --width=400 \
@@ -1609,16 +1609,16 @@ install_utils() {
     goverlay_ok=$(dpkg -l | grep -q "^ii.*goverlay" && echo "✓" || echo "✗")
     
     if [ "$gamemode_ok" = "✓" ] && [ "$mangohud_ok" = "✓" ] && [ "$goverlay_ok" = "✓" ]; then
-        log_info "Installation complète des utilitaires gaming réussie"
+        log_info "Installation complète des GOverlay réussie"
         # Le récapitulatif sera affiché à la fin
     else
-        log_info "Installation partielle des utilitaires gaming"
+        log_info "Installation partielle des GOverlay"
         message="Résultats de l'installation :\n\nGamemode: $gamemode_ok\nMangoHUD: $mangohud_ok\nGOverlay: $goverlay_ok"
         if [ "$gamemode_ok" = "✗" ] || [ "$mangohud_ok" = "✗" ] || [ "$goverlay_ok" = "✗" ]; then
             # Afficher d'abord le message puis proposer les logs
             zenity 2>/dev/null --info --title="Installation partielle" --text="$message"
             if zenity 2>/dev/null --question --title="Consultation des journaux" --text="Certains utilitaires ont échoué.\nSouhaitez-vous consulter les journaux d'erreur ?"; then
-                show_error_logs "Installation partielle des utilitaires gaming"
+                show_error_logs "Installation partielle des GOverlay"
             fi
         else
             zenity 2>/dev/null --info --title="Installation partielle" --text="$message"
@@ -3050,9 +3050,9 @@ uninstall_nvidia_silent() {
     fi
 }
 
-# Fonction de désinstallation des utilitaires gaming
-uninstall_utils() {
-    log_info "Début de la désinstallation des utilitaires gaming"
+# Fonction de désinstallation des GOverlay
+uninstall_GOverlay() {
+    log_info "Début de la désinstallation des GOverlay"
     
     # Vérifier si les utilitaires sont installés
     gamemode_installed=$(dpkg -l | grep -q "^ii.*gamemode" && echo "oui" || echo "non")
@@ -3066,12 +3066,12 @@ uninstall_utils() {
     fi
     
     # Demander confirmation
-    if ! zenity 2>/dev/null --question --title="Confirmation" --text="Êtes-vous sûr de vouloir désinstaller les utilitaires gaming ?"; then
+    if ! zenity 2>/dev/null --question --title="Confirmation" --text="Êtes-vous sûr de vouloir désinstaller les GOverlay ?"; then
         return
     fi
     
     # Demander le mot de passe sudo
-    password=$(zenity 2>/dev/null --password --title="Authentification - Désinstallation utilitaires" --text="Mot de passe sudo requis pour désinstaller les utilitaires gaming:")
+    password=$(zenity 2>/dev/null --password --title="Authentification - Désinstallation utilitaires" --text="Mot de passe sudo requis pour désinstaller les GOverlay:")
     
     
     if [ $? -eq 1 ]; then
@@ -3109,7 +3109,7 @@ uninstall_utils() {
         
         echo "100" ; echo "# Vérification de la désinstallation..."
     ) | zenity 2>/dev/null --progress \
-        --title="Désinstallation des utilitaires gaming" \
+        --title="Désinstallation des GOverlay" \
         --text="Initialisation..." \
         --percentage=0 \
         --width=400 \
@@ -3121,17 +3121,17 @@ uninstall_utils() {
     goverlay_ok=$(dpkg -l | grep -q "^ii.*goverlay" && echo "✗" || echo "✓")
     
     if [ "$gamemode_ok" = "✓" ] && [ "$mangohud_ok" = "✓" ] && [ "$goverlay_ok" = "✓" ]; then
-        log_info "Désinstallation complète des utilitaires gaming réussie"
-        zenity 2>/dev/null --info --title="Succès" --text="Tous les utilitaires gaming ont été désinstallés avec succès !"
+        log_info "Désinstallation complète des GOverlay réussie"
+        zenity 2>/dev/null --info --title="Succès" --text="Tous les GOverlay ont été désinstallés avec succès !"
     elif [ "$gamemode_ok" = "✗" ] || [ "$mangohud_ok" = "✗" ] || [ "$goverlay_ok" = "✗" ]; then
-        log_info "Échec de désinstallation de certains utilitaires gaming"
-        show_error_logs "Échec de désinstallation de certains utilitaires gaming"
+        log_info "Échec de désinstallation de certains GOverlay"
+        show_error_logs "Échec de désinstallation de certains GOverlay"
     fi
 }
 
-uninstall_utils_silent() {
+uninstall_GOverlay_silent() {
     local password="$1"
-    log_info "Début de la désinstallation des utilitaires gaming (mode silencieux)"
+    log_info "Début de la désinstallation des GOverlay (mode silencieux)"
     
     # Vérifier si les utilitaires sont installés
     gamemode_installed=$(dpkg -l | grep -q "^ii.*gamemode" && echo "oui" || echo "non")
@@ -3172,10 +3172,10 @@ uninstall_utils_silent() {
     goverlay_ok=$(dpkg -l | grep -q "^ii.*goverlay" && echo "non" || echo "oui")
     
     if [ "$gamemode_ok" = "oui" ] && [ "$mangohud_ok" = "oui" ] && [ "$goverlay_ok" = "oui" ]; then
-        log_info "Désinstallation complète des utilitaires gaming réussie"
+        log_info "Désinstallation complète des GOverlay réussie"
         return 0
     else
-        log_info "Échec de désinstallation de certains utilitaires gaming"
+        log_info "Échec de désinstallation de certains GOverlay"
         return 1
     fi
 }
@@ -3254,7 +3254,7 @@ if [ $exit_code -eq 1 ]; then
             "mumble") uninstall_display="$uninstall_display\n• Mumble" ;;
             "flatseal") uninstall_display="$uninstall_display\n• Flatseal" ;;
             "nvidia") uninstall_display="$uninstall_display\n• Drivers NVIDIA (ATTENTION: peut affecter l'affichage)" ;;
-            "utils") uninstall_display="$uninstall_display\n• Utilitaires gaming (GameMode, MangoHUD, GOverlay)" ;;
+            "GOverlay") uninstall_display="$uninstall_display\n• GOverlay (GameMode, MangoHUD, GOverlay)" ;;
         esac
     done
 
@@ -3396,11 +3396,11 @@ if [ $exit_code -eq 1 ]; then
                     failed_components="$failed_components\n• Drivers NVIDIA"
                 fi
                 ;;
-            "utils")
-                if uninstall_with_progress "$component" "$password" "Utilitaires gaming" "uninstall_utils_silent"; then
+            "GOverlay")
+                if uninstall_with_progress "$component" "$password" "GOverlay" "uninstall_GOverlay_silent"; then
                     ((success_count++))
                 else
-                    failed_components="$failed_components\n• Utilitaires gaming"
+                    failed_components="$failed_components\n• GOverlay"
                 fi
                 ;;
         esac
@@ -3463,7 +3463,7 @@ else
             "mumble") install_display="$install_display\n• Mumble" ;;
             "flatseal") install_display="$install_display\n• Flatseal" ;;
             "nvidia") install_display="$install_display\n• NVIDIA + CUDA" ;;
-            "utils") install_display="$install_display\n• Goverlay (FPS, CPU, GPU, température)" ;;
+            "GOverlay") install_display="$install_display\n• Goverlay (FPS, CPU, GPU, température)" ;;
         esac
     done
     
@@ -3530,8 +3530,8 @@ else
             "nvidia")
                 install_nvidia
                 ;;
-            "utils")
-                install_utils
+            "GOverlay")
+                install_GOverlay
                 ;;
         esac
         
@@ -3553,7 +3553,7 @@ else
                 "mumble") next_batch_app "Mumble" ;;
                 "flatseal") next_batch_app "Flatseal" ;;
                 "nvidia") next_batch_app "NVIDIA + CUDA" ;;
-                "utils") next_batch_app "Goverlay (performances)" ;;
+                "GOverlay") next_batch_app "Goverlay (performances)" ;;
             esac
         fi
     done
diff --git a/udib.py b/udib.py
index 2e8115e..4990de9 100755
--- a/udib.py
+++ b/udib.py
@@ -7,7 +7,7 @@ from tempfile import TemporaryDirectory
 
 from cli.clibella import Printer
 from cli.parser import get_argument_parser
-from core.utils import assert_system_dependencies_installed, download_and_verify_debian_iso, download_and_verify_debian_testing_iso
+from core.utils import assert_system_dependencies_installed, download_debian_iso_simple, download_debian_testing_iso_simple
 from iso.injection import inject_files_into_iso
 from net.download import download_file
 from net.scrape import get_debian_preseed_file_urls, get_debian_iso_urls, get_debian_testing_iso_urls
@@ -30,8 +30,8 @@ def main():
             path_to_output_file = path_to_output_file.expanduser()
         path_to_output_file = path_to_output_file.resolve()
 
-        if path_to_output_file.exists():
-            p.error(f"Output file already exists: '{path_to_output_file}'.")
+        if path_to_output_file.exists() and not args.force:
+            p.error(f"Output file already exists: '{path_to_output_file}'. Use --force to overwrite.")
             exit(1)
     else:
         path_to_output_file = None
@@ -105,7 +105,7 @@ def main():
                 else:
                     path_to_output_file = Path.cwd() / output_file_name
 
-            download_and_verify_debian_iso(path_to_output_file, printer=p)
+            download_debian_iso_simple(path_to_output_file, printer=p, force=args.force)
             p.success(f"Debian ISO saved to '{path_to_output_file}'.")
             exit(0)
 
@@ -120,10 +120,11 @@ def main():
                 else:
                     path_to_output_file = Path.cwd() / output_file_name
 
-            download_and_verify_debian_testing_iso(path_to_output_file, printer=p)
+            download_debian_testing_iso_simple(path_to_output_file, printer=p, force=args.force)
             p.success(f"Debian testing ISO saved to '{path_to_output_file}'.")
             exit(0)
 
+
     elif args.subparser_name == "inject":
 
         # verify image file path if set by user or download fresh iso if unset