In the question What is “dist-upgrade” and why does it upgrade more than “upgrade”? the accepted answer explains that
linux-headers-3.0.0-13 is a new package replacing
How is it a new package and not simply a new version, and how to know (recognize) the difference?
Further, why is
linux-headers-3.0.0-13 listed in the output of the command
sudo apt-get upgrade if it is a new package and not a new version of an already installed package?
The answer hints at the argument that it is because
linux-headers-3.0.0-13 are connected to the same virtual package ("
linux-headers is a virtual package that is provided by both
linux-headers-3.0.0-13"). Is it for this reason that
linux-headers-3.0.0-13 is listed? And if so, why don't we see other packages provided by other virtual packages suggested as upgrades?
Although the example above concerns kernel packages, my question is not kernel-oriented but more general; or is it of kernel-only relevance?