[mothered]

No problem! What do you mean by the command being isolated to packages from all repositories?

In other words, Is the command dedicated only to downloading & updating the package (lists) from the repositories, or does It perform other functions/updates?

Yes, the "apt update" command only updates the lists, and will not update your actual packages. If you ran "apt full-upgrade" before updating your lists with "apt update," you would not see any available upgrades as your package list is not up-to-date.

Got It, you've answered my question perfectly, thank you.

I haven't used Linux In an In depth manner since the days of BackTrack, so I've lost a lot of what I knew with commands etc. I have various flavors of Linux running on my VMs which I'll periodically get back Into as I did with BT.
Thanks again.