Install libgcr-3-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libgcr-3-doc
Description:
Library for Crypto UI related tasks - documentation
GCR is a library for crypto UI and related tasks. . This package contains the API documentation for the GCR library.
Homepage: https://wiki.gnome.org/Projects/GnomeKeyring
Version: 3.28.0-1
Section: doc