I'm usually a fan of open source games but rarely do they manage to be actually great. People like giving recommendations like Super Tux Kart that haven't aged well and don't play well. What are some open source games that are legitimately good that I've missed?
My favorites are:
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Mindustry
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Sonic Robo Blast 2 Kart
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Powder Toy
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GZDoom (and all the amazing mods for it)
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Veloren (even though it's still in alpha)
The flatpak has been working for me on Linux Mint, although the flatpak didn’t work on Ubuntu proper. From what I understand the Mint devs do some extra tinkering to support flatpaks better than vanilla Ubuntu. Have you tried downloading the binary and running it from a terminal?
The Appimage also works well for me on my Ubuntu XFCE box.
https://www.openra.net/download/#linux
I will try the AppImage. I tried it with other games and it worked fine. flatpak sucks.