[support] CKEdit installation

I downloaded ckeditor and unpacked it. I then transfered the file to /usr/share/drupal6/sites/all/modules/ . _Why wont the editor show up on the site building>modules page_. I did exactly the same thing with WYSIWIG, OpenWYSIWYG and Whizzywig with no problems. This is a Debian Squeeze installation with Drupal 6, manually assembled. (No use of drupal loaders). Any help will be appreciated. Gary R.