Steps in Ubuntu to enable totally automatic updates with auto reboot

ubuntu-enable-totally-automatic-updates.txt

apt-get autoremove && apt-get update

apt-get install unattended-upgrades update-notifier-common
dpkg-reconfigure --priority=low unattended-upgrades 
# choose yes
nano /etc/apt/apt.conf.d/50unattended-upgrades
# set Unattended-Upgrade::Remove-Unused-Dependencies "true";
# set Unattended-Upgrade::Automatic-Reboot "true";

# force install, using old config file if original is modified
# resolves "Package 'x' has conffile prompt and needs to be upgraded manually"
Dpkg::Options {
    "--force-confdef";
    "--force-confold";
};