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-updates and 04:00 reboot
Networking: one 40-net.yaml (eth0 always, wifi via rpi_base_wifi_*) with
cloud-init's 50-cloud-init.yaml deleted after first boot. cloud-init still
renders it on an instance_id bump, and it sorts later, so editing the
card's network-config and bumping meta-data is the headless rescue path.
ssh_deletekeys off so a rescue bump keeps the host keys.
Auto-updates: periodic switches and local policy merged into one
52unattended-upgrades-local; 50unattended-upgrades stays a distro
conffile and debconf's 20auto-upgrades can no longer disable anything.
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