I want to modify the per-installed Ambiance theme in Ubuntu 14.04. It is located in /usr/share/themes/. I copied the Ambiance directory to ~/.themes/ and renamed it to AmbianceDark.
Now I want to show it up in the Appearance Theme menu. Also I do not want to use any external tweak tools. But my search is resulting in only tweak tools to install the modified theme.
How to do it? Any help will be highly appreciated.