gnustep-core-doc software package provides GNUstep Development Environment -- core documentation, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gnustep-core-doc
gnustep-core-doc is installed in your system.
Make ensure the gnustep-core-doc package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnustep-core-doc *
You will get with gnustep-core-doc package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | X Window System software |
| Package | gnustep-core-doc |
| Version | 7.8 |
| Description | GNUstep Development Environment -- core documentation |
| Sub Section | X250 |