OpenRA is a free and open source standalone game engine for Windows, MacOS and Linux. It is released under GNU General Public License v3.0. It comes with three distinct mods Red Alert, Tiberian Dawn and Dune 2000. According to the game developer, when you run a mod for the first time the game can automatically download the original freeware game assets. These game assets are not covered by OpenRA’s GNU General Public License. For more info about the legal check this link.
How to Install OpenRA on Ubuntu Linux
OpenRA is available as a snap, flatpak and portable Appiamge file formats. Open the terminal application (ctrl+alt+t) and run below OpenRA game engine snap install command. It will install the latest version of OpenRA game engine and 3 modes.
sudo snap install openra
After the installation, click the show applications menu in Ubuntu dock and type openRA in the search box. It will show all 3 modes. Just click and play each mode.
Install OpenRA via Flatpak:
First install flatpak and flathub on your system and restart it after the installation.
Now open the terminal cmd app (ctrl+alt+t) and run below OpenRA flatpak install command.
flatpak install flathub net.openra.OpenRA
After the installation, you can open it using below command.
flatpak run net.openra.OpenRA
And uninstall it using below command.
sudo flatpak uninstall net.openra.OpenRA
Install OpenRA using AppImage:
Download the latest OpenRA Red Alert, Tiberian Dawn and Dune 2000 in .AppImage file from the above download link and save it on your Downloads folder. Now in the terminal app in below command to start it.
sudo chmod +x ~ OpenRA-Red-Alert-x86_64.AppImage
sudo chmod +x ~ OpenRA-Dune-2000-x86_64.AppImage
sudo chmod +x ~ OpenRA-Tiberian-Dawn-x86_64.AppImage
After that run each game mode using below command.