IIAB "1-liner" Install Scripts @ http://d.iiab.io/6.6 should:

0. [ Interactively populate local_vars.yml based on the preferences of the implementer/operator WHILE below updates are being downloaded & installed? ]
1. Install OS security updates e.g. "apt update; apt -y dist-upgrade" then...
2. Reboot then...
3. Auto-continue with IIAB installation

Potentially followed by:

4. Reboot upon IIAB install completion
5. MAYBE: Display confirmation message that IIAB install was successful??

As part of IIAB 6.7 or 7.0? (Unlikely this will be ready in time for IIAB 6.6 in coming weeks!)