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Rackspace's RackConnect v2 product is not currently compatible with Ubuntu 18 LTS.
RackConnect automation fails to configure the OS-level network stack, typically creating a Support ticket.
Ubuntu 18 uses a new network config application, "netplan," which is not compatible with RackConnect v2 automation.
Use Ubuntu 16 LTS, or upgrade to RackConnect v3, which is newer, simpler, and more secure.