all ubuntu appliances are ubuntu core, the highly secure, fully containerised linux with transactional updates and data snapshot guardrails that can always roll back to a known-good state. emergency repair mechanisms provide safety nets in the event of a bad update. ubuntu appliances evolve and improve automatically, every day, with no human intervention needed. millions of devices use these mechanisms every day for critical software updates around the world. the underlying package delivery system optimises bandwidth and efficiency with compressed binary delta updates that reduce total traffic and speed up the delivery of critical fixes.