Any packages that don't have a newer version in the repo that you currently have installed.  What it actually installs is entirely determined by your distribution (guessing you're running Ubuntu since it's common and uses aptitude), so the guys in charge of Ubuntu determine what does and doesn't get upgraded with that command.  apt-get upgrade will, in fact upgrade your kernel if there is a kernel package in your repo.  Also, some distros will even download firmware packages and install them (but usually not the bios).  Also, without running an update there's no way to know if there are any new packages.

If you want an explicit list of what it will upgrade, type in:
apt-get --just-list upgrade

On Thu, Dec 18, 2014 at 6:50 PM, Michael Havens <bmike1@gmail.com> wrote:

what doesn't 'apt-get upgrade' uhhhhh,.. what doesn't it upgrade?

1- the kernel

2- the BIOS (which doesn't really count since it isn't part of the OS)

3- ?

:-)~MIKE~(-:

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Todd Millecam

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