Trying again.

ntos/configs/minimal/preseed.cfg

@@ -45,7 +45,6 @@ d-i mirror/http/mirror select deb.debian.org
 d-i apt-setup/non-free boolean true
 d-i apt-setup/contrib boolean true
 d-i apt-setup/enable-source-repositories boolean false
-d-i apt-setup/disable-cdrom-entries boolean true
 
 d-i apt-setup/services-select multiselect security, updates
 d-i pkgsel/update-policy select full-upgrade
@@ -64,8 +63,7 @@ d-i grub-installer/force-efi-extra-removable boolean true
 d-i grub-installer/only_debian boolean true
 
 d-i preseed/late_command string \
-    in-target /bin/bash -c '\
-    echo "deb http://ftp.de.debian.org/debian bookworm-backports main" > /etc/apt/sources.list.d/backport.list && \
+    in-target /bin/bash -c 'echo "deb http://ftp.de.debian.org/debian bookworm-backports main" > /etc/apt/sources.list.d/backport.list && \
     apt-get update && \
     apt-get install -y xfce4 xfce4-goodies xfce4-power-manager system-config-printer xfce4-panel-profiles xsane plymouth-themes dbus-x11 network-manager-gnome curl yad freerdp3-x11 && \
     apt-get autoremove -y && \