I've set up unattended-upgrade on an Ubuntu 14.04.1 server. It has installed the kernel .41 over .40 yesterday at 4:10. Automatic reboot is configured for 3:00, so it should have rebooted last night. But it didn't.

Today, it installed another kernel version .43. Still the /var/run/reboot-required file does not exist, and the mail from unattended-upgrade doesn't contain any notice of a required reboot. So I don't expect the scheduled reboot to work tomorrow and the new kernel still won't be applied.

What's the issue here? Why doesn't that work as configured?


APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";


Unattended-Upgrade::Automatic-Reboot "true";
Unattended-Upgrade::Automatic-Reboot-Time "03:00";

1 Answer 1


Do you have update-notifier-common installed? According to this you need it for automatic reboots to work.

  • Didn't have it installed. Now I have, but I'm still waiting for updates that require a reboot. Can't verify the success until then.
    – ygoe
    Dec 20, 2014 at 18:58

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