I'm trying to apply the following theme: http://gnome-look.org/content/show.php/H4k3r?content=156969
I have a .themes folder in "Home" folder but Ubuntu Tweak Tool won't detect it. Running 13.04
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I'm trying to apply the following theme: http://gnome-look.org/content/show.php/H4k3r?content=156969
I have a .themes folder in "Home" folder but Ubuntu Tweak Tool won't detect it. Running 13.04
That is a theme for GNOME's login and display manager. Since Ubuntu uses LightDM by default, you would need to install GDM to replace it. During installation, you should be asked to choose one, because there can be only one. I don't know if this is a very good idea, because there is a slight chance that the Unity desktop relies on some feature of LightDM.
A quick search indicated that GDM has a configuration manager that allows you to browse your files and select the theme from there. If that doesn't work for you, then look at How can I change the login screen theme in GDM?