Below is preseed file that can be used to do an automatic installation of Ubuntu with contextualization. To use it, you need to give the following arguments to the kernel:

auto=true priority=critical url=http://example-server.com/example-preseed.txt

#### Contents of the preconfiguration file

### Localization
d-i	debian-installer/locale			string	en_US
# Keyboard selection.
d-i	console-setup/ask_detect		boolean	false
#d-i	keyboard-configuration/modelcode	string	pc105
d-i	keyboard-configuration/layoutcode	string	us
#d-i	keyboard-configuration/variantcode	string	dvorak

### Network configuration
d-i	netcfg/choose_interface			select	auto
d-i	netcfg/get_hostname			string	unassigned-hostname
d-i	netcfg/get_domain			string	unassigned-domain

### Clock and time zone setup
d-i	clock-setup/utc				boolean	true
d-i	time/zone				string	Etc/UTC
d-i	clock-setup/ntp				boolean	false
#d-i	clock-setup/ntp-server			string	ntp.lal.in2p3.fr


### Partitioning
d-i	partman-auto/method			string	regular
d-i	partman-lvm/device_remove_lvm		boolean	true
d-i	partman-md/device_remove_md		boolean	true
d-i	partman-lvm/confirm			boolean	false
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-md/confirm			boolean	true

### Account setup
d-i	passwd/root-login			boolean	true
d-i	passwd/make-user			boolean	false
d-i	passwd/root-password-crypted		password $1$lFa4QIio$Wb8v1xsKePKngDT6CDqeF0
d-i	user-setup/allow-password-weak		boolean	true
d-i	user-setup/encrypt-home			boolean	false


### Apt setup
#d-i apt-setup/restricted boolean true
#d-i apt-setup/universe boolean true
#d-i apt-setup/backports boolean true
#d-i apt-setup/services-select multiselect security
#d-i apt-setup/security_host string security.ubuntu.com
#d-i apt-setup/security_path string /ubuntu
#d-i debian-installer/allow_unauthenticated boolean true

### Package selection
tasksel tasksel/first multiselect server, openssh-server
#d-i pkgsel/include string openssh-server build-essential
d-i pkgsel/upgrade select full-upgrade
d-i pkgsel/update-policy select none

### Boot loader installation
d-i grub-installer/only_debian boolean true
d-i grub-installer/with_other_os boolean true

### Finishing up the installation
d-i finish-install/reboot_in_progress note
#d-i cdrom-detect/eject boolean false
#d-i debian-installer/exit/halt boolean true
d-i debian-installer/exit/poweroff boolean true

### Preseeding other packages
# Depending on what software you choose to install, or if things go wrong
# during the installation process, it's possible that other questions may
# be asked. You can preseed those too, of course. To get a list of every
# possible question that could be asked during an install, do an
# installation, and then run these commands:
#   debconf-get-selections --installer > file
#   debconf-get-selections >> file


#### Advanced options
### Running custom commands during the installation
# d-i preseeding is inherently not secure. Nothing in the installer checks
# for attempts at buffer overflows or other exploits of the values of a
# preconfiguration file like this one. Only use preconfiguration files from
# trusted locations! To drive that home, and because it's generally useful,
# here's a way to run any shell command you'd like inside the installer,
# automatically.

# This first command is run as early as possible, just after
# preseeding is read.
#d-i preseed/early_command string anna-install some-udeb
# This command is run immediately before the partitioner starts. It may be
# useful to apply dynamic partitioner preseeding that depends on the state
# of the disks (which may not be visible when preseed/early_command runs).
#d-i partman/early_command \
#       string debconf-set partman-auto/disk "$(list-devices disk | head -n1)"
# This command is run just before the install finishes, but when there is
# still a usable /target directory. You can chroot to /target and use it
# directly, or use the apt-install and in-target commands to easily install
# packages and run commands in the target system.
#d-i preseed/late_command string apt-install zsh; in-target chsh -s /bin/zsh
d-i preseed/late_command string rm /target/etc/udev/rules.d/70-persistent-*.rules ; \
                                echo "/dev/sdb swap swap defaults 0 0" >> /target/etc/fstab ; \
                                in-target wget http://quattorsrv.lal.in2p3.fr/vm/tezier/stratuslab-one-context_0.0.1-1.20111215_all.deb ; \
                                in-target dpkg -i stratuslab-one-context_0.0.1-1.20111215_all.deb ; \
                                sed -i 's/context_device.*$/context_device=sr0/' /target/etc/stratuslab/stratuslab-one-context.cfg ; \
                                sed -i 's#exit\ 0$#/usr/bin/stratuslab-one-context#' /target/etc/rc.local ; \
                                echo "exit 0" >> /target/etc/rc.local ; \
                                sed -i 's#!/bin/sh$#!/bin/bash#' /target/usr/bin/stratuslab-one-context

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