Install gir1.2-cryptui-0.0 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-cryptui-0.0
Description:
GObject introspection data for the CryptUI library
CryptUI is a library to manage OpenPGP prompts on GUI applications. . This package contains introspection data for the CryptUI library. . It can be used by packages using the GIRepository format to generate dynamic bindings.
Homepage: http://developer.gnome.org/libcryptui/
Version: 3.12.2-5
Section: universe/introspection