So I try the Stable release:
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Err:12 http://nginx.org/packages/ubuntu tricia Release
404 Not Found [IP: 95.211.80.227 80]

E: The repository 'http://nginx.org/packages/ubuntu tricia Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
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Are there any other instructions available to get Nginx 1.17 downloaded?