I have very low internet speed in my home. I need to install GUI for Ubuntu server edition without the use of the internet. I have an Ubuntu desktop CD. How do I do this?
You can follow these steps (but, accordingly to psusi's comment, this only will work with the DVD or Alternate CD versions of Desktop Edition)
 First step: add your CD / DVD to the sources list.
 Second step: update with:
 Third step: install desktop environment
 Fourth and final step: restore your source list to the previous state
Uncomment everything you had 'commented' before (if you want, comment CD again) with: