[THIS](http://www.ubuntuthemes.org/downloads/aurora-3-16/) is the theme I'd like to install. What I've done so far:

1. Extracted Dark-Aurora folder from the archive.
2. Copied that folder to `~/usr/share/themes`.
3. Created `/home/[user-name]/.themes` folder and copied Dark-Aurora there too.
4. Opened Unity Tweak Tool, clicked on Theme.
5. Only the three default themes (Ambiance, Highcontrast and Radiance) are there). Dark-aurora is nowhere to be found.

So what am I doing wrong? Thanks in advance.