Updating ubuntu using cd rom
Furthermore, in most cases it is not necessary to download all of the images for your architecture.
The packages are sorted by popularity: The first CD/DVD/BD contains the installation system and the most popular packages.
The second one contains slightly less popular ones, the third one even less popular ones, etc.
You will probably only need the first couple of DVDs (or the first few CDs) unless you have very special requirements.
If you don't have that existing installation, then you'll need to use the normal installation CDs/DVDs.
Packages of the category have restrictions that conflict with this, so these packages are not placed on the official CDs.