I am now using Ubuntu 12.10 and I tried to install Gnome Shel Extension and Gnome Tweak Tool. However, here is my problem :
You can see that my tweak tool does not receive user themes.. When I checked the Ubuntu Software Center, I see that GNOME Shell Extension Preferences and GNOME Shel User Themes has already installed.
So, what is my problem, and how can I fix it ? Please help me. Thanks.