The title says it all – it's at Howtoforge, so it can't go wrong.
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This howto offers a simple way of creating DVD images of Debian or Ubuntu http/ftp repositories.
Ubuntu doesn't offer DVDs ready to download with its main, universe, multiverse and/or restricted repositories. With the contents of this howto you can do it yourself.
Having the Ubuntu or Debian repositories on DVD can be useful for those users who don't have access to the Internet where they have their Ubuntu installed but have access somewhere else to download the repository and build and burn the DVDs.