balsa software package provides e-mail client 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 balsa
balsa is installed in your system.
Make ensure the balsa package were installed using the commands given below,
$ sudo dpkg-query -l | grep balsa *
You will get with balsa package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | GNOME |
| Package | balsa |
| Version | 2.4.12-2 |
| Description | e-mail client for GNOME |
| Sub Section | GNOME |