Install libcaja-extension-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libcaja-extension-doc
Description:
libraries for Caja components (API documentation files)
Caja is the official file manager for the MATE desktop. It allows one to browse directories, preview files and launch applications associated with them. It is also responsible for handling the icons on the MATE desktop. It works on local and remote filesystems. . This package contains the API documentation for the libraries needed by Caja's extensions.
Homepage: http://www.mate-desktop.org/
Version: 1.20.2-4ubuntu1
Section: universe/doc