Minimal preseed.cfg for network installation of Ubuntu 14.04 "Trusty Tahr"

preseed.cfg

d-i debian-installer/locale string en_US
d-i time/zone string Europe/Berlin
d-i console-setup/ask_detect boolean false
d-i keyboard-configuration/layoutcode string de
d-i netcfg/choose_interface select auto
d-i netcfg/get_hostname string unassigned-hostname
d-i netcfg/get_domain string unassigned-domain
d-i mirror/country string manual
d-i mirror/http/hostname string archive.ubuntu.com
d-i mirror/http/directory string /ubuntu
d-i mirror/http/proxy string
d-i clock-setup/utc boolean true
d-i clock-setup/ntp boolean true
d-i clock-setup/ntp-server string pool.ntp.org

d-i partman-auto/method string lvm
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-lvm/guided_size string max
d-i partman-auto/choose_recipe select atomic
d-i partman/default_filesystem string xfs
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-md/confirm boolean true
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 passwd/user-fullname string Ubuntu User
d-i passwd/username string ubuntu

# replace password (clear text) in lines below
d-i passwd/user-password password XXXXXXX
d-i passwd/user-password-again password XXXXXXXX
d-i user-setup/allow-password-weak boolean true

d-i user-setup/encrypt-home boolean false

tasksel tasksel/first multiselect server
d-i pkgsel/include string openssh-server

unattended-upgrades unattended-upgrades/enable_auto_updates boolean false
d-i pkgsel/update-policy select none

popularity-contest popularity-contest/participate 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