Installation Problem

[Deleuca]

I'm having trouble installing the theme. As far as I can tell, the dependencies are installed, but I'm not sure how to definitively verify that this is the case. (I tried to apt-get install gnome-themes-extra and engines-murrine, and the terminal saus they were already installed. libgtk also seems to be installed.
When I go into gnome-tweaks to set the theme, no changes happen, and if I try to restart gnome, the whole thing crashes.

Can anyone help me set this up?