/usr/share/themes/Arc/index.theme is in arc-theme 20180114-1ubuntu1.
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=Arc
Comment=A flat theme with transparent elements
Encoding=UTF-8
[X-GNOME-Metatheme]
GtkTheme=Arc
MetacityTheme=Arc
IconTheme=gnome
CursorTheme=DMZ-Black
ButtonLayout=menu:minimize,maximize,close
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