gnome-characters software package provides character map application, 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-characters
gnome-characters is installed in your system.
Make ensure the gnome-characters package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-characters *
You will get with gnome-characters package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | GNOME |
| Package | gnome-characters |
| Version | 3.18.1-1 |
| Description | character map application |
| Sub Section | GNOME |