Install yelp by entering the following commands in the terminal:
sudo apt update sudo apt install yelp
Description:
Help browser for GNOME
Yelp is the help browser for the GNOME desktop. Yelp provides a simple graphical interface for viewing DocBook, Mallard, HTML, man, and info formatted documentation.
Homepage: https://wiki.gnome.org/Apps/Yelp
Version: 3.26.0-1ubuntu2
Section: gnome