Comment 6 for bug 1044788

Can you please confirm if Adwaita theme provides the following CSS color properties:
@dark_fg_color;
@dark_bg_color;
@fg_color;

These theme colors are used by ubiquity as can be seen in:
http://bazaar.launchpad.net/~ubuntu-installer/ubiquity/trunk/view/head:/ubiquity/frontend/gtk_ui.py

The intended upstream design is to have Dark title bar with Light color font text, light color centre stage with dark font text, and a dark progress area with light font text (visible during installation progress).

These are standard features / colors provided by the gtk-theme engines. Please make sure Adwaita theme supports / provides sensible values there.