Ubuntu

Binary package “gnome-themes-extra” in ubuntu bionic

  1. Bionic (18.04)
  2. gnome-themes-extra

Adwaita GTK+ 2 theme — engine

 This is the version of Adwaita, the standard GNOME theme, for the
 GTK+ 2.x toolkit.
 .
 The GTK+ 3.x version is already included in libgtk-3-0.
 .
 This package contains the Adwaita theme engine.

Source package