Apticron is a handy little application that uses cron to check for updates to your Ubuntu Server install on a daily basis. It will check in with the Ubuntu mothership and send you email if any new updates are available, which is important for avoiding known security vulnerabilities.
Install apticron: to send a daily email alert if there are available updates for your system:
sudo apt-get -y install apticron
Configure apticron to check for updates daily and send email if any new updates are available:
