Each Ubuntu clone derived from the same snapshot shared an identical
machine-id, causing systemd-networkd to use the same DHCP client-id
and receive the same NAT IP triggering IP collision failures.
Step 7b truncates /etc/machine-id and removes /var/lib/dbus/machine-id
before the snapshot is taken. On first boot each clone generates a
fresh machine-id from /dev/urandom -> unique DHCP client-id -> unique IP.
Simone
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