Bad news: you’d have to download all its dependencies in advance as well. While the packages.ubuntu .com site does tell you which packages it dependencies on, this can get quite tiresome if those packages in turn have dependencies on other packages. I’ve been there, and it wasn’t fun :( There might very well be a site that bundles all this into one big download, and if not, there should be :P You could also check whether the application you’re trying to install offers a binary file (i.e. you just extract it, then double-click to run it), but that can get quite messy. Which applications are you trying to install? I might see if I can install them, check which dependencies it installs and bundle them in an archive.