Не знал про такую возможность, теперь буду знать.
Проверил где указана эта опция.
ubiquity --help
/usr/bin/ubiquity:74: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
import imp
Usage: ubiquity [options] [frontend]
Options:
--version show program's version number and exit
-h, --help show this help message and exit
-d, --debug debug mode (warning: passwords will be logged!)
--pdb drop into Python debugger on a crash
--cdebconf use cdebconf instead of debconf (experimental)
--automatic do not ignore the "seen" flag (useful for unattended
installations).
--only tell the application that it is the only desktop
program running so that it can customize its UI to
better suit a minimal environment.
-q, --query find out which frontend will be used by default
-g, --greeter allow the user to leave the installer and enter a live
desktop (for the initial boot).
-b, --no-bootloader Do not install a bootloader.
--ldtp Name widgets in ATK by their GtkBuilder names, to
support LDTP testing.
--autopilot Export variables needed for autopilot to drive ubiquity
UI.
--wireless Force enable the wireless page, even if network is
available.
UBIQUITY(8) BSD System Manager's Manual UBIQUITY(8)
NAME
ubiquity — install Ubuntu from a live CD
SYNOPSIS
ubiquity [--desktop file] [--debug] [--pdb] [--cdebconf] [--automatic]
[--only] [--query] [frontend]
DESCRIPTION
ubiquity is a graphical installer for Ubuntu, written largely in Python,
using debian-installer (d-i) as a backend for many of its functions. It
is normally invoked from a desktop icon, and presents a "wizard"-style
graphical user interface. ubiquity must be run as root, and will esca‐
late privileges for itself using gksudo, kdesu, kdesudo, or sudo as ap‐
propriate.
ubiquity has multiple frontends, including one written using GTK+
(gtk_ui) and one written for KDE (kde_ui). The first non-option argu‐
ment, if any, is interpreted as the name of the frontend to use.
The following options are available:
--desktop file
This option is passed through to gksudo to provide a better de‐
scription for its privilege-escalation message. It is only rele‐
vant when using the gtk_ui frontend.
-d, --debug
Run in debugging mode, sending verbose information to
/var/log/installer/debug that may be useful to developers. (The
/var/log/syslog file is usually required in any case, along with
/var/log/partman in the case of problems related to partitioning.)
Note that passwords will be logged in debugging mode!
--pdb
Drop into the Python debugger in the event of a crash. Only effec‐
tive if ubiquity is being run from a terminal.
--cdebconf
Use cdebconf instead of the traditional Perl debconf implementa‐
tion. In future this may provide enough memory efficiency benefits
to be made the default, but for now it is not really worthwhile and
is therefore for experimental use only.
--automatic
Skip over questions that have been pre-answered by use of a preseed
file. This is useful for unattended installations.
--only
Tell ubiquity that it is the only desktop program running so that
it can customize its user interface to better suit a minimal envi‐
ronment. This allows the installer to be run standalone, reducing
memory requirements.
--query
Print the frontend that would be used and then exit.
AUTHORS
Ubiquity was formerly known as "Espresso", and originally as "Ubuntu Ex‐
press", which is written and maintained by Javier Carranza
<javier.carranza@interactors.coop> and Juanje Ojeda Croissier
<juanje@interactors.coop>. This version draws on the work done on Ubuntu
Express, but was renamed to avoid confusion, to reduce awkward branding
considerations, and because Ubiquity concentrates on reusing
debian-installer code and reducing duplicated translation and branding
work as much as possible. Ubiquity has now substantially diverged from
Ubuntu Express and is an independent project.
ubiquity was mainly developed by Colin Watson <cjwatson@ubuntu.com> and
Evan Dandrea <ev@ubuntu.com>, with contributions from many others.
The mythbuntu_ui frontend was developed by Mario Limonciello
<superm1@ubuntu.com>.
Ubuntu August 9, 2007 Ubuntu
Из этой информации стало понятно что ubiquity это графический интерфейс для debian-installer.
Документация предлагает так устанавливать систему без загрузчика.
sudo ubiquity -b gtk_ui
Вариант от denkin тоже рабочий, так как ubiquity умеет автоматически выбирать фронтенд.
Систему переустанавливать не планирую, поэтому не планирую проверять запишется ли загрузчик.