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To follow up on the discussion in the comments, this occurs if for some reason you don't have permission to use the default TCP port (8888) used by the Jupyter Notebook server. Opening the Sage Shell and manually running sage --notebook=jupyter --port=<portnum> where <portnum> can be some large integer (try something larger than 8888, but less than 32000) and it should work depending on your system's configuration.

The fact that this crashes rather than automatically try a different port is a bug: