d-i finish-install/reboot_in_background doesn't suppress the 'Installation
complete, click Continue' dialog in Trixie. Instead, fork a background
reboot from late_command that fires 3s after setup completes, killing the
dialog before it can block. Also removes the redundant reboot_in_background
setting.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Conflicts=getty@tty1 ensures systemd releases TTY1 before kiosk-setup
runs interactively. Also add partman/choose_partition select finish to
preseed so disk write confirmation is fully automated.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>