Unattended Upgrades

Configure Unattended Upgrades on Ubuntu (unattended-upgrades package)

Official Ubuntu Docs

AutomaticSecurityUpdates - Community Help Wiki

Reconfigure Unattended Upgrades

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

Config Files location

/etc/apt/apt.conf.d/

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

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