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https://www.gamingonlinux.com/2023/05/comet-is-an-open-source-implementation-of-gog-galaxy-sdk-that-needs-testing/
GOG still seem to be insisting that devs compile for Ubuntu 18.04, an ancient OS due to be retired in days.

What a joke.
That's a good news, even for Windows user if it work on Windows too as a lot of people don't like the 2.0 launcher.
Lutris is soon to support cloud saves