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Ok, so apparently some people haven't used apt before. This here page is a repository of tidbits of information that might be useful.

Basics

To update the package repositories (for security purposes or whatnot):

apt-get update

To upgrade everything

apt-get upgrade

To install “foopackage”, or upgrade it to the latest version:

apt-get install foopackage

Other stuff

To prevent a package from being upgraded (for example we use this with apache, as we need to maintain our own version):

echo foopackage hold | dpkg --set-selections
apt-get upgrade # or whatever

To see the changelogs for a package:

aptitude changelog foopackage

To check the current version of a package, and the version that apt wants to install:

apt-cache policy foopackage

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