How to download the dependent packages at one time?

[xq_dl]

 I am want to install xCAT on Ubuntu 12.04 LTS (Codename: precise) on a machine which can not access the network. This software need lots of dependent software, like expect, libsys-virt-perl, etc.

 I have to search and download  *.deb file on another machine, and copy to this machine. But I found it is very difficult to get all dependent package at one time. I had to try "apt-get install xcat" again and again to fetch the dependent packages' name. Is there a way to download all packages for a distribution like the Redhat DVD iso?

Thanks.
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