I have downloaded the dvd (12.04) and I want to sure I have installed every thing on it, so that I may save my INTERNET usage when I need to install new packages. That is, apt wont download the packages that are already installed. Any idea ? thanks a lot.
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As far as I am aware, all apt frontends (apt-get, aptitude, synaptic, etc) will only download a new package if it's not already installed, however, it will download updated packages for anything you've installed, hence, installing everything may actually increase your internet usage.
If you make sure the line starting deb cdrom: in /etc/apt/sources.list does not have a comment # character at the start, and always put your DVD in when trying to install any new packages you want, then apt should use the DVD copy if it's still the latest version. Obviously, if there's an update on the internet, it will use that instead.
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