sudo apt-get install unattended-upgrades update-notifier-common
/etc/apt/apt.conf.d/50unattended-upgrades:
Unattended-Upgrade::Allowed-Origins {
"Ubuntu lucid-security";
// "Ubuntu lucid-updates";
};
/etc/apt/apt.conf.d/10periodic:
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "1";
APT::Periodic::AutocleanInterval "7";
APT::Periodic::Unattended-Upgrade "1";
Also check:
cat /etc/apt/apt.conf.d/20auto-upgrades
APT::Periodic::Update-Package-Lists “1″;
APT::Periodic::Unattended-Upgrade “1″;
log: /var/log/unattended-upgrades
source