Pioneer is a free and open source space trading and combat game for Linux, Mac OS X, and Microsoft Windows. The game is open world game so your are free explore the planets in galaxy without any set objectives. This game is heavily inspired by Frontier Elite 2 game. It is released under open source GNU general public license. It is a single player offline space adventure game. Some other similar type of space trading and combat games are Oolite and Endless Sky.
Install Pioneer via Flatpak:
Pioneer space game is available as a flatpak package for ubuntu. So you can easily install it on Ubuntu via flathub. For that first you need to install and setup flatpak on your ubuntu system. Follow the below link to install and setup flatpak on Ubuntu.
After the installation of flatpak in you Ubuntu pc, Open your terminal console app (Ctrl+Atl+T) and run the below command to install Pioneer.
flatpak install flathub net.pioneerspacesim.Pioneer
During the installation press y and enter when it asked to confirm the installation. It will install the latest version Pioneer game. you can run Pioneer by running the below command.
flatpak run net.pioneerspacesim.Pioneer