debconf-get-selectionsのどの値をプレシードしてはいけませんか？
私のシステムの現在の構成に対して行われたDebianインストールの選択を、新しいシステムのインストールに複製したい。
Debianは、「事前設定」（別名「preseed」）ファイルを使用して事前設定できます。このファイルには、基本的に、インストーラーが尋ねる質問への回答が含まれています。
documentation は、Debianの既存のインストールから事前設定ファイルを作成する1つの方法は次のとおりであることを示しています：
... debconf-utilsパッケージの
debconf-get-selectionsを使用して、debconfデータベースとインストーラーのcdebconfデータベースの両方を1つのファイルにダンプします。
$ debconf-get-selections --installer > file$ debconf-get-selections >> file
しかし、それはすぐに追加されます：
ただし、この方法で生成されたファイルには、事前シードしてはならない項目がいくつかあります...
ドキュメンテーションでは、事前シードされるべきではないそれらの項目について詳しく説明していません。
誰かが詳しく説明できますか？
例として、上記の2つのコマンドから取得した出力の2番目のフィールドを以下に含めます。ここでは、d-iで始まる行だけをコメントとともに保持し、簡潔にするために切り捨てている場合があります。 （d-iで始まる構成行のみを保持する理由は、Debianによって提供される 例の事前構成ファイル では、そのような行のみが表示されるためです。）
# Check the integrity of another CD-ROM?
cdrom-checker/nextcd
# Web server started, but network not running
save-logs/no_network
# for internal use only
debian-installer/consoledisplay
debian-installer/Shell-plugin
# Country, territory or area:
# Choices: Antigua and Barbuda, Australia, Botswana, Canada, ...
localechooser/shortlist
# for internal use; can be preseeded
preseed/include_command
# Country of Origin for the keyboard:
# Choices:
keyboard-configuration/layout
# Choices: Canada, Mexico, Saint Pierre and Miquelon, United ...
localechooser/countrylist/North_America
# Choices: Greece, Cyprus, other
localechooser/shortlist/el
# Keyboard layout:
# Choices:
keyboard-configuration/variant
# Choices: Algeria, Angola, Benin, Botswana, Burkina Faso, Bu...
localechooser/countrylist/Africa
# Choices: Finland, Sweden, other
localechooser/shortlist/sv
# Keep default keyboard options ()?
keyboard-configuration/unsupported_options
# Choices: Cyprus, Turkey, other
localechooser/shortlist/tr
# Interactive Shell
di-utils-Shell/do-Shell
# for internal use only
# Choices: stable, testing, unstable
cdrom/suite
# Choose an installation step:
# Choices:
debian-installer/missing-provide
# Check CD-ROM integrity?
cdrom-checker/start
# Failed to retrieve the preconfiguration file
preseed/retrieve_error
# Directory in which to save debug logs:
save-logs/directory
# for internal use only
debconf/showold
# Failed to open checksum file
cdrom-checker/md5file_failed
# Choices: Andorra, Spain, France, Italy, other
localechooser/shortlist/ca
# Write the changes to the storage devices and configure RAID...
partman-md/confirm_nooverwrite
# PCMCIA resource range options:
hw-detect/pcmcia_resources
# Failed to mount the floppy
save-logs/floppy_mount_failed
# for internal use only
debconf/language
# Choices: China, Singapore, Taiwan, Hong Kong, other
localechooser/shortlist/zh_TW
# Dummy template for preseeding unavailable questions
debian-installer/dummy
# Additional parameters for module :
hw-detect/retry_params
# Incorrect CD-ROM detected
cdrom-detect/wrong-cd
# for internal use; can be preseeded
cdrom-detect/eject
# Choices: Argentina, Bolivia, Chile, Colombia, Costa Rica, E...
localechooser/shortlist/es
# for internal use; can be preseeded
preseed/run
# Write the changes to disks and configure LVM?
partman-lvm/confirm_nooverwrite
# Cannot save logs
save-logs/bad_directory
# Choices: Belgium, Canada, France, Luxembourg, Switzerland, ...
localechooser/shortlist/fr
# Insufficient memory
lowmem/insufficient
# for internal use
keyboard-configuration/optionscode
# Choices: China, Taiwan, Singapore, Hong Kong, other
localechooser/shortlist/zh_CN
# Load missing firmware from removable media?
hw-detect/load_firmware
# Choices: Italy, Switzerland, other
localechooser/shortlist/it
# Choices: Antarctica
localechooser/countrylist/Antarctica
# Choose the next step in the install process:
# Choices: Choose language, Configure the speech synthesizer ...
debian-installer/main-menu
# Failed to load installer component
anna/install_failed
# Choices: Russian Federation, Ukraine, other
localechooser/shortlist/ru
# for internal use
keyboard-configuration/modelcode
# Entering low memory mode
lowmem/low
# Choices: Jordan, United Arab Emirates, Bahrain, Algeria, Sy...
localechooser/shortlist/ar
# Keep current keyboard options in the configuration file?
keyboard-configuration/unsupported_config_options
# Choices: Antigua and Barbuda, Australia, Botswana, Canada, ...
localechooser/shortlist/en
# Method for toggling between national and Latin mode:
# Choices: Caps Lock, Right Alt (AltGr), Right Control, Right...
keyboard-configuration/toggle
# for internal use only
anna/retriever
# Choices: Curaçao
localechooser/countrylist/other
# Choices: Albania, Andorra, Armenia, Austria, Azerbaijan, Be...
localechooser/countrylist/Europe
# locale
localechooser/help/locale
# Load CD-ROM drivers from removable media?
cdrom-detect/load_media
# for internal use; can be preseeded
debian-installer/framebuffer
# for internal use
espeakup/voice
# for internal use; can be preseeded
preseed/include
# Error reading Release file
cdrom-detect/no-release
# Ignore questions with a priority less than:
# Choices: critical, high, medium, low
debconf/priority
# Key to function as AltGr:
# Choices: The default for the keyboard layout, No AltGr key,...
keyboard-configuration/altgr
# CD-ROM detected
cdrom-detect/success
# Choices: Bouvet Island, Falkland Islands (Malvinas), Saint ...
localechooser/countrylist/Atlantic_Ocean
# Continue the install without loading kernel modules?
anna/no_kernel_modules
# for internal use; can be preseeded
debian-installer/exit/poweroff
# Choices: Bangladesh, India, other
localechooser/shortlist/bn
# for internal use; can be preseeded
preseed/include/checksum
# Integrity test failed
cdrom-checker/mismatch
# Load missing drivers from removable media?
hw-detect/load_media
# Keep default keyboard layout ()?
keyboard-configuration/unsupported_layout
# Start PC card services?
hw-detect/start_pcmcia
# for internal use; can be preseeded
debian-installer/add-kernel-opts
# for internal use; can be preseeded
mouse/protocol
# for internal use; can be preseeded
mouse/left
# for internal use
keyboard-configuration/layoutcode
# for internal use
keyboard-configuration/store_defaults_in_debconf_db
# Choices: Brazil, Portugal, other
localechooser/shortlist/pt
# for internal use; can be preseeded
preseed/early_command
# for internal use only
debian-installer/exit/always_halt
# Choices: Africa, Antarctica, Asia, Atlantic Ocean, Caribbea...
localechooser/continentlist
# Insert Debian boot CD-ROM
cdrom-checker/firstcd
# How should the debug logs be saved or transferred?
# Choices: floppy, web, mounted file system
save-logs/menu
# for internal use; can be preseeded
rescue/enable
# for internal use only
cdrom-detect/cdrom_fs
# Insert formatted floppy in drive
save-logs/insert_floppy
# Translations temporarily not available
localechooser/translation/none-yet
# Keymap to use:
# Choices: American English, Albanian, Arabic, Asturian, Bang...
keyboard-configuration/xkb-keymap
# for internal use; can be preseeded
mouse/device
# for internal use only
cdrom-detect/hybrid
# for internal use only
debconf/translations-dropped
# Country to base default locale settings on:
# Choices: Antigua and Barbuda${!TAB}-${!TAB}en_AG, Australia...
localechooser/preferred-locale
# Choices: Spain, France, other
localechooser/shortlist/eu
# Choices: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuad...
localechooser/countrylist/South_America
# Failed to mount CD-ROM
cdrom-checker/mntfailed
# Retry mounting the CD-ROM?
cdrom-detect/retry
# Choices: Serbia, Montenegro, other
localechooser/shortlist/sr
# Module needed for accessing the CD-ROM:
# Choices:
cdrom-detect/cdrom_module
# for internal use; can be preseeded
preseed/file
# for internal use; can be preseeded
hw-detect/load-ide
# for internal use; can be preseeded
preseed/interactive
# Installation step failed
debian-installer/main-menu/item-failure
# Error while running ''
hw-detect/modprobe_error
# Choices: Pakistan, India, other
localechooser/shortlist/pa
# Use Control+Alt+Backspace to terminate the X server?
keyboard-configuration/ctrl_alt_bksp
# Choices: China, India, other
localechooser/shortlist/bo
# Language:
# Choices: C${!TAB}-${!TAB}No localization, Albanian${!TAB}-$...
localechooser/languagelist
# Installer components to load:
# Choices:
anna/choose_modules_lowmem
# for internal use only
debian-installer/language
# for internal use
keyboard-configuration/variantcode
# Choices: Anguilla, Antigua and Barbuda, Aruba, Bahamas, Bar...
localechooser/countrylist/Caribbean
# Language selection no longer possible
localechooser/translation/no-select
# Failed to copy file from CD-ROM. Retry?
retriever/cdrom/error
# Choices: Afghanistan, Bahrain, Bangladesh, Bhutan, Brunei D...
localechooser/countrylist/Asia
# Write the changes to disk and configure encrypted volumes?
partman-crypto/confirm_nooverwrite
# for internal use; can be preseeded
debian-installer/country
# No valid Debian CD-ROM
cdrom-checker/wrongcd
# Choices: Belgium, Germany, Liechtenstein, Luxembourg, Austr...
localechooser/shortlist/de
# for internal use; can be preseeded
anna/standard_modules
# Failed to process the preconfiguration file
preseed/load_error
# for internal use; can be preseeded
preseed/file/checksum
# Device file for accessing the CD-ROM:
cdrom-detect/cdrom_device
# for internal use; can be preseeded
directfb/hw-accel
# for internal use; can be preseeded
debian-installer/allow_unauthenticated
# Continue the installation in the selected language?
localechooser/translation/warn-severe
# for internal use; can be preseeded
debian-installer/theme
# Choices: American Samoa, Australia, Cook Islands, Fiji, Fre...
localechooser/countrylist/Oceania
# Are you sure you want to exit now?
di-utils-reboot/really_reboot
# Choices: Brazil, Portugal, other
localechooser/shortlist/pt_BR
# for internal use only
debconf/frontend
# for internal use; can be preseeded
debian-installer/exit/halt
# Choices: Belize, Costa Rica, El Salvador, Guatemala, Hondur...
localechooser/countrylist/Central_America
# Keep the current keyboard layout in the configuration file?
keyboard-configuration/unsupported_config_layout
# Compose key:
# Choices: No compose key, Right Alt (AltGr), Right Control, ...
keyboard-configuration/compose
# Method for temporarily toggling between national and Latin ...
# Choices: No temporary switch, Both Logo keys, Right Alt (Al...
keyboard-configuration/switch
# Installer components to load:
# Choices: cfdisk-udeb: Manually partition a hard drive (cfdi...
anna/choose_modules
# Integrity test successful
cdrom-checker/passed
# Manually select a CD-ROM module and device?
cdrom-detect/manual_config
# Terminal plugin not available
debian-installer/terminal-plugin-unavailable
# Insert a Debian CD-ROM
cdrom-checker/askmount
# Additional locales:
# Choices: aa_DJ.UTF-8, aa_DJ, aa_ER, aa_ER@saaho, aa_ET, af_...
localechooser/supported-locales
# for internal use only
cdrom-detect/usb-hdd
# for internal use; can be preseeded
preseed/late_command
# Failed to run preseeded command
preseed/command_failed
# Modules to load:
# Choices:
hw-detect/select_modules
# Keyboard model:
# Choices:
keyboard-configuration/model
# Continue the installation in the selected language?
localechooser/translation/warn-light
# Choices: Aruba, Belgium, Netherlands, other
localechooser/shortlist/nl
# for internal use only
cdrom/codename
# Choices: British Indian Ocean Territory, Christmas Island, ...
localechooser/countrylist/Indian_Ocean
# for internal use; can be preseeded
preseed/boot_command
# Web server started
save-logs/httpd_running
# System locale:
# Choices:
debian-installer/locale
# Choices: Macedonia\, Republic of, Albania, other
localechooser/shortlist/sq
# Country of Origin for the keyboard:
# Choices:
keyboard-configuration/layout
# Keymap to use:
# Choices: American English, Albanian, Arabic, Asturian, Bang...
keyboard-configuration/xkb-keymap
# Keyboard layout:
# Choices: English (US), English (US) - Cherokee, English (US...
keyboard-configuration/variant
# Keep default keyboard options ()?
keyboard-configuration/unsupported_options
# Use Control+Alt+Backspace to terminate the X server?
keyboard-configuration/ctrl_alt_bksp
# for internal use
keyboard-configuration/variantcode
# for internal use
keyboard-configuration/optionscode
# for internal use
keyboard-configuration/modelcode
# Keep current keyboard options in the configuration file?
keyboard-configuration/unsupported_config_options
# Keep the current keyboard layout in the configuration file?
keyboard-configuration/unsupported_config_layout
# Method for toggling between national and Latin mode:
# Choices: Caps Lock, Right Alt (AltGr), Right Control, Right...
keyboard-configuration/toggle
# Compose key:
# Choices: No compose key, Right Alt (AltGr), Right Control, ...
keyboard-configuration/compose
# Method for temporarily toggling between national and Latin ...
# Choices: No temporary switch, Both Logo keys, Right Alt (Al...
keyboard-configuration/switch
# Key to function as AltGr:
# Choices: The default for the keyboard layout, No AltGr key,...
keyboard-configuration/altgr
# Keep default keyboard layout ()?
keyboard-configuration/unsupported_layout
# Keyboard model:
# Choices: A4Tech KB-21, A4Tech KBS-8, A4Tech Wireless Deskto...
keyboard-configuration/model
# for internal use
keyboard-configuration/layoutcode
# for internal use
keyboard-configuration/store_defaults_in_debconf_db
短い答え
D-I preseed専用のDebian wikiページ から：
Debconf-get-selections（--installer）で生成されたpreseed.cfgを削除せずに、そこから値を取得し、それらを使用してサンプルのpreseedファイルを変更します。
Debianが提供する preseedの例 ファイルで十分ですが、同じWikiページで、さまざまな目的のためにさまざまな人々によって提供されている他の多くのpreseedファイルを見つけることができます。
短い回答
あなたが投稿したdebconf質問のリストでは、「内部で使用できる」というコメントが付いている各質問は、「事前シード可能」なしで事前シードされるべきではありません。
ただし、ハードウェア関連の質問（別のハードウェアでインストールを実行する場合）、自動構成の失敗または成功を記録する質問（これにより、問題が発生する可能性がある）など、他の多くのdebconf質問はpreseedファイルで事前回答されない場合があります。いくつかの特殊なケースではpreseedされますが、自動プロセスで問題なく回答できます）。
Debconf-get-selectionsの出力には、ほとんどの人が決して見たことがなく、気にしない（すべき）自動回答の質問が多数含まれています。この自動選択は時間とともに変化し、新しいハードウェア、ソフトウェア、より良い検出、または新しい可能性があります。 debian-installerのすべての改善の恩恵を享受し、時間の経過およびさまざまなハードウェアに対してpreseedファイルに必要な変更を最小限に抑えることができるように、自動設定にできる限り手を触れないことが重要です。