Why does the system restart trigger at 3:30 every day?

[lay]

ubuntu22 desktop

 

Why does the system restart trigger at 3:30 every day？？

I used 'uptime'to check the changes in running time！

How to turn off the trigger！

 

sudo grep "3:3[0-9]" /var/log/syslog | grep -i "unattended\|reboot"
Sep 19 03:30:53 armbian-ramlog[451]: unattended-upgrades/
Sep 19 03:30:53  armbian-ramlog[451]: unattended-upgrades/unattended-upgrades-dpkg.log
Sep 19 03:30:53  armbian-ramlog[451]: unattended-upgrades/unattended-upgrades-shutdown.log
Sep 19 03:30:53  armbian-ramlog[451]: unattended-upgrades/unattended-upgrades.log
Sep 19 03:30:53  cron[604]: (CRON) INFO (Running @reboot jobs)
Sep 19 03:30:54 systemd[1]: Started Unattended Upgrades Shutdown.

I have tried to experiment, but it still doesn't work：

50unattended-upgrades

"

Unattended-Upgrade::Automatic-Reboot "false";

"

 

Please help help    

Thank you.

[Werner]

Checked here?https://serverfault.com/questions/1042988/automatic-reboot-at-specific-time-if-automatic-upgrade-requires-reboot