Are you talking about the 'Overglossed' theme? I just verified that it works. How are you installing it? All you do is d'load it and then right click on your desktop>>change desktop backgroun>>themes and then drag'n'drop into the window. This worked for me.
EDIT: LOL!!! Sorry, I'm blind as a bat! Didn't read the subject for this post...
If you have downloaded it to your desktop (default), then right click on the file and "Extract Here'. Then open a terminal and enter the following:
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sudo mv ~/Desktop/Ultimate_1.8 /usr/share/gdm/themes
Enter your password, then close out the terminal. Then go to System>>Administration>>Login Window and go to the 'local' tab then select the new GDM. Restart or CNTRL+ALT+Backspace to check it out.