criticalmass software package provides Shoot-em-up a la galaxian, 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 criticalmass
criticalmass is installed in your system.
Make ensure the criticalmass package were installed using the commands given below,
$ sudo dpkg-query -l | grep criticalmass *
You will get with criticalmass package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Games |
| Package | criticalmass |
| Version | 1:1.0.0-4 |
| Description | Shoot-em-up a la galaxian |
| Sub Section | Games |