/usr/share/themes/Night-Impression/index.theme is in community-themes 0.23.2.
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=Night-Impression
Comment=Ubuntu 10.10 dark theme
Encoding=UTF-8
Name[en_US]=Night-Impression
[X-GNOME-Metatheme]
GtkTheme=Night-Impression
MetacityTheme=Night-Impression
IconTheme=ubuntu-mono-dark
CursorTheme=DMZ-White
ButtonLayout=close,minimize,maximize:
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