Ubuntu: Automatically Update

1. Install Ubuntu first (see older post)
2. Install the unattended updates:
   sudo apt-get install unattended-upgrades
3. Edit the config (see official docs)
   sudo vi /etc/apt/apt.conf.d/50unattended-upgrades
   e.g. uncomment: updates; Remove-Unused-Dependencies; Automatic-Reboot-Time
4. Edit the apt config for periodic checks
   sudo vi /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";
5. If you want to run it straight away:
   sudo unattended-upgrade -d