gnome-screenshot software package provides screenshot application for GNOME, 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 gnome-screenshot
gnome-screenshot is installed in your system.
Make ensure the gnome-screenshot package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-screenshot *
You will get with gnome-screenshot package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | GNOME |
| Package | gnome-screenshot |
| Version | 3.18.0-1ubuntu2 |
| Description | screenshot application for GNOME |
| Sub Section | GNOME |