Where are Adwaita, HighContrast and HighContrastInverse GTK themes located in Ubuntu 18.04?

When I opened gnome tweaks in Ubuntu 18.04, I found these 3 themes but could not find the location.

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GTK+ includes the Adwaita and HighContrast themes

From and

Basically, Adwaita and the High Contrast theme are now part of GTK+ (the GIMP Toolkit) and no longer provided as separate themes as Ambiance or Radiance are.

In a comment to this answer ,there is a mention of gnome-themes-extra with a link to

The referenced package list has:

/usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/engines/libadwaita.so
/usr/share/doc/gnome-themes-extra/NEWS.gz
/usr/share/doc/gnome-themes-extra/README.md
/usr/share/doc/gnome-themes-extra/changelog.Debian.gz
/usr/share/doc/gnome-themes-extra/copyright 

In other words, this package does provide Adwaita, but only for gtk2 applications.

apt show gnome-themes-extra has:

Description: 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.

In short,there's no way to remove Adwaita or High Contrast themes without removing libgtk-3-0 itself which will take out a host of applications depending on libgtk-3-0.

You can simulate what will happen by using -s for ensuring a simulation. Because it's a simulation, there's no need for sudo:

apt purge -s libgtk-3-0

The exact output will depend on what you have on your system.

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