I'm new here so I'll try to make this concise.

I recently installed a dark theme for inkscape and just realized it applied to my whole ubuntu system. Unfortunately, I don't recall the name (stupidly, I wasn't paying much attention to what I was doing) and it has made some app settings unusable.

I definitely used the terminal to install some parts of this dark theme if that helps.

For example here is what inkscape's preferences window looks like.

Kind of unreadable..

And here is what ActionAz looks like.

there is no .themes directory in ~/ (pressed Ctrl+H to see hidden files)

and there is no /theme directory in /usr/share/inkscape.

I guess whatever I installed went somewhere else and is affecting my whole opperating system. I've tried googling, messing around in system settings, and even looking around through unity tweak tool. Any Idea how to remove it or just reset the operating system to default?

As I said I'm new and have been messing around with stuff. I had installed compizconfig-settings-manager recently and wanted to mention it because it could have something to do with this issue. I have since uninstalled it hoping to solve this without any luck.

EDIT:
Thanks to war1oc for helping to solve this issue. As suggested here, these two commands reset unity and got rid of the problem:

dconf reset -f /org/compiz/

setsid unity