In its default configuration, unattended-upgrades is broken in Raspbian Buster. It won't install crucial updates for the kernel and other software. Your options are:
Recommended Option:
- Install and fix unattended-upgrades:
sudo apt install unattended-upgrades
echo 'Unattended-Upgrade::Origins-Pattern {
// Fix missing Rasbian sources.
"origin=Debian,codename=${distro_codename},label=Debian";
"origin=Debian,codename=${distro_codename},label=Debian-Security";
"origin=Raspbian,codename=${distro_codename},label=Raspbian";
"origin=Raspberry Pi Foundation,codename=${distro_codename},label=Raspberry Pi Foundation";
};' | sudo tee /etc/apt/apt.conf.d/51unattended-upgrades-raspbian
For faster security updates (but less stability, as the packages haven't been approved for rasbian), you can add debian-security packages to apt:
echo 'deb http://deb.debian.org/debian-security/ buster/updates main contrib non-free' | sudo tee /etc/apt/sources.list.d/debian-security.list
You will probably need to install new apt keys for the debian repository.
Other Options:
Work around it with by using cron-apt:
sudo apt install cron-aptOther ways to work around it.
Work around it with by using cron-apt:sudo apt install cron-apt
It's recommended to use unattended-updates and fix the package, because it's best suited for the purpose. Cron-apt is your second-best option, because it's also designed for a similar purpose. I'm not sure eithercron-apt can automatically reboot your system after a kernel update. Unattended-upgrades usually has that option, but I'm not sure itand in my experience reboot after kernel upgrade works with the fix above.