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No, it works under all systems.
It is very linux friendly and there are lot of good guides.

Here is comprehensive resource list.

https://www.reddit.com/r/cryptobismuth/comments/73myat/comprehensive_list_of_resources_for_the_bismuth/

OK, I just looked at the main site and did not find any package for Ubuntu Linux. I did not searched for guides.

Bismuth does not support Windows 7 but Windows 10, Linux and Mac.

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