How to Enable Automatic Security Updates

Step 1: Install Unattended Upgrades

sudo apt install unattended-upgrades -y

Step 2: Configure Updates

sudo dpkg-reconfigure --priority=low unattended-upgrades

Step 3: Edit Configuration File (Optional)

sudo nano /etc/apt/apt.conf.d/50unattended-upgrades

Uncomment:

"${distro_id}:${distro_codename}-security";

Step 4: Enable Auto-Reboot (Optional)

sudo nano /etc/apt/apt.conf.d/20auto-upgrades

Set:

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

Step 5: Test Configuration

sudo unattended-upgrades --dry-run