Broadcast message for updating the system

After starting the UbuntuCore, it printed these informations as below!
What should I do for it? Why the system print these informations?

The system found an upgrade, downloaded and installed it and wants to reboot into the new version. It tells you about it so that you can save open documents etc…

If you do not want it to reboot, you can tell it so with “sudo shutdown -c”

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