gjiten software package provides Japanese dictionary 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 gjiten
gjiten is installed in your system.
Make ensure the gjiten package were installed using the commands given below,
$ sudo dpkg-query -l | grep gjiten *
You will get with gjiten package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | X Window System software |
| Package | gjiten |
| Version | 2.6-2.3ubuntu1 |
| Description | Japanese dictionary for GNOME |
| Sub Section | X219 |