This is one of the things I like most about Chrome OS and many newer Android devices (like Pixel phones): A/B updates.
Chrome OS keeps two full copies of the OS, one on the A partition and one on the B partition. When an update happens, it gets applied to the inactive partition, then the system sets a flag that switches which partition is the boot partition.
You update at that point by rebooting. The nice thing is that this happens naturally most of the time when you shut down the machine.
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