Install .deb files without any Internet

view story

http://askubuntu.com – I want to install ndiskgtk and whenever I click the .deb file, it gets me through the Software Center. I don't have any Internet so I can't install it. Will this method above work? I am 13 years old, so I'm not really that smart with Linux. I want to install ndiskgtk (I think that's what it's called) so that I can get internet to work. (HowTos)