I recently upgraded from 16.10 to 18.04.2. On 16.10 I ran /usr/lib/update-notifier/apt-check indicating the number of unapplied updates and how many of them are security updates. On 18.04.2 this returns "0;0" until I run sudo apt-get update. As I was using the apt-check to tell when to run the update this is less useful.
Have I missed a piece of configuration or what steps should I take to raise a useful bug report