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I'm trying to create a custom ISO of ubuntu 18.04 using the official ubuntu-18.04.1-live-server-amd64.iso as a base image with my own set of preseed files to later create a vagrant box with packer.

I keep getting an error where the /root filesystem is missing (see attached screenshot at the end) and he solutions I've found around on forums use fsck (which is also missing) by loading it from a LiveCD to workaround this problem; but their fix doesn't apply to me as I'm trying to pack a working image.

I tried using the seeder files that come within ubuntu-18.04.1-live-server-amd64.iso but had no luck with that and then I used the following sites as reference to build up my seeder.cfg file:

  1. https://help.ubuntu.com/lts/installation-guide/amd64/apbs04.html#preseed-l10n
  2. https://help.ubuntu.com/lts/installation-guide/example-preseed.txt
  3. https://d-i.debian.org/manual/example-preseed.txt

Here is my preseed file:

d-i debian-installer/locale string en_US.UTF-8
d-i keyboard-configuration/xkb-keymap select us
d-i passwd/root-password-crypted password __PASSWORD__
d-i passwd/user-fullname string vagrant
d-i passwd/username string vagrant
d-i passwd/user-password-crypted password __PASSWORD__
d-i user-setup/allow-password-weak boolean true
d-i time/zone string US/Central
d-i clock-setup/ntp boolean true
d-i partman-auto/method string regular
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 pkgsel/include string curl openssh-server sudo git vim
d-i pkgsel/language-packs multiselect
d-i grub-installer/only_debian boolean true
d-i finish-install/reboot_in_progress note
d-i preseed/late_command string                                               \
    echo 'Defaults:vagrant !requiretty' > /target/etc/sudoers.d/vagrant;      \
    echo 'vagrant ALL=(ALL) NOPASSWD: ALL' >> /target/etc/sudoers.d/vagrant;  \
    chmod 440 /target/etc/sudoers.d/vagrant;                                  \
    ln -sf /dev/null /target/etc/systemd/network/99-default.link;             \
    in-target update-initramfs -u

And the file is used like this from /isolinux/adtxt.cfg:

label bionic
  menu label ^Custom Install
  kernel /casper/vmlinuz
  append  initrd=/casper/initrd net.ifnames=0 auto-install/enable=true debconf/priority=critical file=/cdrom/preseed/ubuntu-18.04/preseed.cfg ---

Any help or guidance will be highly appreciated.

Error message

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The preseed file mechanism works well with the Debian Installer, but Ubuntu 18.04 LTS Live images uses a new installer called Subiquity, which instead uses an answers.yml file mechanism to provide answers to installer questions.

However, if you download from the CD Image directory, you can still find 18.04 LTS images with the old Debian installer, which will use your preseed file.

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