Found the following threads here on UbuntuForums, and they worked for me. Have Unity working fine now.
shows a handy command to check hardware setup for unity requirements:
My hardware passed that check.
When I tried to start unity from a terminal, it failed with a
so I checked for that text on the forums here and found this thread:
Couldn't find a perfect decorator match; trying all decorators
Found no decorator to start
I did what it said there:
which wipes your existing user preferences for your desktop and re-creates.
rm -rf .gnome .gnome2 .gconf .gconfd .metacity
sudo apt-get remove ubuntu-desktop
sudo apt-get install ubuntu-desktop
Hope this helps you out as well!