Found by an emulated install: Subiquity refuses --username admin (a
system group) at boot with 'Username is reserved by the system', after
the user has already written the stick. Check against subiquity's
reserved-usernames list at build time instead.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Cjz8a58eB5P9sUweqd3NHm
iso/build-iso.sh remasters the official 26.04.x live-server ISO (downloaded
and checksum-verified, or --iso PATH) with xorriso, replaying its BIOS/UEFI
boot records unchanged. It adds:
- /autoinstall.yaml: Subiquity autoinstall that answers locale/keyboard/SSH
and by default leaves only network, storage and identity interactive
(--username/--auto-storage/--auto-network/--no-confirm/--fully-automatic
make those automatic too). late-commands copy the repo (a clone of the
current HEAD) to /opt/ubuntu-based-kiosk and enable a first-boot service.
- iso/firstboot/kiosk-firstboot(.service): on first boot, takes tty1, waits
for cloud-init and internet, copies the repo to the admin user's home and
runs ./install.sh as that user with temporary passwordless sudo (removed
on every exit path). Failed/interrupted installs re-run next boot.
install.sh hooks for this:
- KIOSK_UNATTENDED=1 makes ask_yes_no take each prompt's default and skips
the Core Settings menu (--unattended).
- KIOSK_PROVISION_DONE_MARKER is touched by provision_finish before the
reboot prompt, so the caller can tell a finished install from an
interrupted one.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Cjz8a58eB5P9sUweqd3NHm
Claude