More than 18?
Verify your age
Downloading and running GOG Galaxy on Ubuntu is a unique process because GOG does not currently offer a native Linux client. However, Ubuntu users can still access their libraries through unofficial community tools or compatibility layers. 1. Recommended Way: Heroic Games Launcher
Download the .deb package from the official GitHub page and double-click to install, or use the terminal: sudo apt install ./heroic_*.deb .
If you specifically want the authentic GOG Galaxy interface, you must run the Windows version through a compatibility layer.