How to know the required packages of one package before installing, in Ubuntu?

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http://www.linuxquestions.org – Hi Everybody, I have Ubuntu 9.10 installed on my laptop. And I am going to install mediaplayer from its "*.deb" file, But it requires a lot of other packages and each of those packages needs others and so on. Since I do not have internet connection on my Ubuntu and my internet connection is in Win XP, so I should download these packages and then check them in my Ubuntu and see what other packages it needs and download them and so on. It is a very time consuming task. If I could find out what are all the required packages I could download all of them at once and then I could install them by "sudo dpkg -i *". Therefore I am wondering if there is a way to know which packages are the required ones for a typical package, my work would be much more easier. I would be so grateful if some one could help me. With best regards, Hassan (HowTos)