I have read What classifies an application as 'installed' in Ubuntu? but it does not address the following issue:
When I run
apt list --installed on Kubuntu 16.04, I see that all my listed packages have
[installed,automatic]. Yet, I've see reports where users have a few or even the majority of their packages being described as
[installed,local]. And in this, last, case, their packages seem to be outdated.
[installed,local] the equivalent of what the Synaptic Package Manager would describe as "local or obsolete" as discussed in What does “local or obsolete” mean in Synaptic?