calligra-l10n-ru software package provides Russian (ru) localization files for Calligra, 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 calligra-l10n-ru
calligra-l10n-ru is installed in your system.
Make ensure the calligra-l10n-ru package were installed using the commands given below,
$ sudo dpkg-query -l | grep calligra-l10n-ru *
You will get with calligra-l10n-ru package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | KDE |
| Package | calligra-l10n-ru |
| Version | 1:2.9.5-0ubuntu2 |
| Description | Russian (ru) localization files for Calligra |
| Sub Section | KDE |