gnome-calculator software package provides GNOME desktop calculator, 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-calculator
gnome-calculator is installed in your system.
Make ensure the gnome-calculator package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-calculator *
You will get with gnome-calculator package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Mathematics |
| Package | gnome-calculator |
| Version | 1:3.18.3-0ubuntu1 |
| Description | GNOME desktop calculator |
| Sub Section | Math |