/usr/share/themes/ukui-theme/index.theme is in ukui-themes 0+git20170606-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Type=X-GNOME-Metatheme
Name=ukui-theme
Comment=ukui-theme GTK3 theme
Encoding=UTF-8
Name[en]=ukui-theme
[X-GNOME-Metatheme]
GtkTheme=ukui-theme
MetacityTheme=ukui-theme
IconTheme=ukui-icon-theme
CursorTheme=ukui-icon-theme
ButtonLayout=:minimize,maximize,close
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