[lbruder]

Go to /etc/apt/apt.conf.d/ and have a look at 50unattended-upgrades and 10periodic. My 10periodic looks like this:

    APT::Periodic::Update-Package-Lists "1";
    APT::Periodic::Download-Upgradeable-Packages "1";
    APT::Periodic::AutocleanInterval "7";
    APT::Periodic::Unattended-Upgrade "1";

And 50unattended-upgrades:

    Unattended-Upgrade::DevRelease "false";
    Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";
    Unattended-Upgrade::Remove-Unused-Dependencies "false";
    Unattended-Upgrade::Automatic-Reboot "true";
    Unattended-Upgrade::Automatic-Reboot-Time "02:00";

No more worrying about updates :)