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Hello, I would like to ask if Rainbow Six: Siege (multiplayer modes) will work on Linux (Ubuntu) via Ubisof Connect, when I was looking at ProtonDB (Steam only), so there was a problem with BattleEye. Thanks.
As it stands, Linux OS is not supported for Rainbow Six Siege therefore we wouldn't be able to make any recommendations on this, however the game is available on Stadia as well as GeForce Now (just as Jakub27blue suggested), therefore you can look it up to see if you'd be able to set it up to play through cloud based gaming service.
Apologies if this was not the outcome you may have anticipated and if you have any further questions, let us know!