Install gir1.2-gconf-2.0 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-gconf-2.0
Description:
GNOME configuration database system (GObject-Introspection)
GConf is a configuration database system for storing application preferences. It supports default or mandatory settings set by the administrator, and changes to the database are instantly applied to all running applications. It is written for the GNOME desktop but doesn't require it. . This package contains introspection data for GConf. It can be used by packages using the GIRepository format to generate dynamic bindings.
Homepage: http://projects.gnome.org/gconf/
Version: 3.2.6-4ubuntu1
Section: universe/introspection