Here's how to setup your debian to update automatically

apt-get install unattended-upgrades apt-listchanges mailutils postfix

vi /etc/apt/apt.conf.d/50unattended-upgrades

Automate:

dpkg-reconfigure -plow unattended-upgrades

Mails:

dpkg-reconfigure postfix
systemctl reload postfix

Test:

unattended-upgrade -d

Following https://bugs.kali.org/view.php?id=8587
Change in /etc/apt/apt.conf.d/50unattended-upgrades

//        "origin=Debian,codename=${distro_codename},label=Debian-Security";
//        "origin=Debian,codename=${distro_codename}-security,label=Debian-Security";
 
        "origin=Kali,codename=${distro_codename}";

• https://wiki.debian.org/UnattendedUpgrades