An Ubuntu desktop preseed file

ubunt-desktop.seed

d-i     debian-installer/locale string en_US.UTF-8
d-i     debian-installer/splash boolean false
d-i     console-setup/ask_detect        boolean false
d-i     console-setup/layoutcode        string us
d-i     console-setup/variantcode       string 

# network
d-i     netcfg/get_nameservers  string 
d-i     netcfg/get_ipaddress    string 
d-i     netcfg/get_netmask      string 255.255.255.0
d-i     netcfg/get_gateway      string 
d-i     netcfg/confirm_static   boolean true
d-i	  netcfg/get_hostname	string passed-as-kernel-parameter-in-cobbler

# mirror settings
d-i     mirror/country string manual
d-i     mirror/http/hostname string mirror-url
d-i     mirror/http/directory string /ubuntu
d-i     mirror/http/proxy string
d-i     mirror/udeb/components multiselect main, restricted


# partitioning
d-i     partman-auto/method string regular
d-i     partman-lvm/device_remove_lvm boolean true
d-i     partman-lvm/confirm boolean true
d-i     partman/confirm_write_new_label boolean true
d-i     partman/choose_partition        select Finish partitioning and write changes to disk
d-i     partman/confirm boolean true
d-i     partman/confirm_nooverwrite boolean true
d-i     partman/default_filesystem string ext4

d-i     clock-setup/utc boolean true
d-i     clock-setup/ntp boolean true
d-i     clock-setup/ntp-server  string ntp.ubuntu.com
d-i     clock-setup/utc boolean true

d-i     base-installer/kernel/image     string linux-generic
d-i     passwd/root-login       boolean false
d-i     passwd/make-user        boolean true
d-i     passwd/user-fullname    string narkisr
d-i     passwd/username string narkisr
d-i     passwd/user-password-crypted    password crypt-string
d-i     passwd/user-uid string 
d-i     user-setup/allow-password-weak  boolean false
d-i     user-setup/encrypt-home boolean false
d-i     passwd/user-default-groups      string adm cdrom dialout lpadmin plugdev sambashare
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  string false

tasksel tasksel/first multiselect ubuntu-desktop

d-i     pkgsel/upgrade  select safe-upgrade
d-i     pkgsel/language-packs   multiselect 
d-i     pkgsel/update-policy    select none
d-i     pkgsel/updatedb boolean true
d-i     grub-installer/skip     boolean false
d-i     lilo-installer/skip     boolean false
d-i     grub-installer/only_debian      boolean true
d-i     grub-installer/with_other_os    boolean true
d-i     finish-install/keep-consoles    boolean false
d-i     finish-install/reboot_in_progress       note 
d-i     preseed/late_command string \
        in-target wget http://host/scripts/script.sh -O /tmp/script.sh; \
        in-target /bin/bash /tmp/script.sh
d-i     cdrom-detect/eject      boolean true
d-i     debian-installer/exit/halt      boolean false
d-i     debian-installer/exit/poweroff  boolean false
d-i     pkgsel/include string byobu vim openssh-server puppet 
byobu   byobu/launch-by-default boolean true

Hey, Im using cobbler with the following kernel options:

priority=critical locale=en_US

This gist is from this post:

http://narkisr.com/blog/2011/3503f63073b5263a911c92f384000b3f

You might find it useful