The debian-installer
is used for only for Server & Alternative CD. As you can see in InstallCDCustomization
That reference is quiet old ~2010 and it is clear from screen-shot that it uses server image. AFAIK, Alternative image is not released any more for Ubuntu.
Live uses ubiquity
installer, check in UbiquityAutomation for available options.
Available preseeding keys
Ubiquity uses a subset of the components that Ubuntu's version of
debian-installer uses and therefore asks the same questions for those
components. However, there are some additional questions provided.
These are as follows:
ubiquity/summary: preseed empty to avoid the summary page.
ubiquity/reboot: automatically reboot when the installer completes. Be sure to add 'noprompt' to the kernel command line to
also skip the "please remove the disc, close the tray (if any) and
press ENTER to continue" usplash prompt.
ubiquity/failure_command: specify a command to be run should the install fail.
ubiquity/success_command: similar to preseed/late_command. Specify a command to be run when the install completes successfully (runs
outside of /target, but /target is mounted when the command is
invoked).
Furthermore, there are a few other components necessary for an
automated installation with ubiquity:
languagechooser/language-name: choose among the available languages, eg English
countrychooser/shortlist: choose a country, territory or area, eg US
localechooser/supported-locales: choose other locales to be supported, eg en_US.UTF-8
Preseeding keys for the following installer components will not be
used in Ubiquity, usually because they do not fit with Ubiquity's mode
of operation:
netcfg
LVM and RAID partitioning
base-installer
pkgsel/tasksel
finish-install
You can use preseed/early_command with the live CD; it will be run by
"casper" (the component which sets up a live environment at boot time)
from the initramfs. Please note that, if you want to affect files in
the live environment, this means that you must prefix their filenames
with /root.