Install gir1.2-lokdocview-0.1 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-lokdocview-0.1
Description:
GTK3 widget wrapping LibreOffice functionality - introspection
LOKDocView is the GTK3 widget that wraps the libreoffice functionality and exposes a simple API for applications to use this widget. . This package contains the Introspection data.
Homepage: http://www.libreoffice.org
Version: 1:6.0.3-0ubuntu1
Section: introspection