gnome-user-guide software package provides GNOME users guide, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gnome-user-guide
gnome-user-guide is installed in your system.
Make ensure the gnome-user-guide package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-user-guide *
You will get with gnome-user-guide package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | GNOME |
| Package | gnome-user-guide |
| Version | 3.4.1-1 |
| Description | GNOME users guide |
| Sub Section | GNOME |