too many language at install

i am guessing you live in the united states and speak only english. ubuntu is distributed internationally. that is to all corners of the earth. there are 1000s of languages that people outside the united states speak and few people speak english. so, instead of making 1000s of different versions, different languages are incorporated into one version. the only languages installed is the one you chose during installation.

does that answer your question?

In addition to what Marcus said, I'm guessing you're referring to the way that the installation images have many language packs pre-installed on them. This allows us to make them usable as a "live CD" in multiple languages without needing to install the language pack at run-time, which speeds up startup. It isn't too bad at installation time because the installer generally doesn't actually copy the files associated with language packs you aren't going to use, although it does need to tell the package manager that those packages are no longer installed. (The result of all this is still typically quicker than a non-live-CD-based installation.)

Some DVD images do take a long time at installation due to having a very large number of language packs preinstalled for use in the live session. That may not be your situation, but if it is, an analysis is here: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/667243