preseed.conf

d-i debian-installer/local string en_GB.UTF-8
d-i debian-installer/language string en
d-i debian-installer/country string GB

d-i keyboard-configuration/xkb-keymap select gb
d-i keyboard-configuration/toggle select No toggling

d-i hw-detect/load_firmware boolean true

d-i mirror/protocol string http
d-i mirror/country string manual
d-i mirror/http/hostname string deb.debian.org
d-i mirror/http/directory string /debian
d-i mirror/http/proxy string

d-i mirror/suite string unstable
d-i mirror/udeb/suite string unstable

d-i passwd/root-login boolean true
d-i passwd/make-user boolean false
d-i passwd/root-password-crypted password $1$zQcvwUMn$4dLVBbxOdT6A2AQiKcuDy/

d-i clock-setup/utc boolean true
d-i time/zone string europe/london
d-i clock-setup/ntp boolean true

d-i partman-auto/init_automatically_partition select Guided - use entire disk
d-i partman-auto/method string regular
d-i partman-auto-lvm/guided_size string max
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-md/device_remove_md boolean true
d-i partman-lvm/confirm boolean true
d-i partman-lvm/confirm_nooverwrite boolean true
d-i partman-auto/choose_recipe select atomic
d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select finish
d-i partman/confirm boolean true
d-i partman/confirm_nooverwrite boolean true
d-i partman-partitioning/choose_label select gpt
d-i partman-partitioning/default_label string gpt
d-i partman-efi/non_efi_system boolean true

d-i base-installer/kernel/image string linux-image-amd64

d-i apt-setup/non-free boolean true
d-i apt-setup/contrib boolean true
d-i apt-setup/disable-cdrom-entries boolean true

d-i pkgsel/run_tasksel boolean false

d-i grub-installer/only_debian boolean true
d-i grub-installer/with_other_os boolean true

d-i finish-install/reboot_in_progress note