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Launching Jupyter involves getting the browser to open a file.

This seems to be the step where the error occurs.

A quick websearch points to a problem with the way WSL opens files:

• websearch: "This protocol is not supported before version 1903"

Some of the answers to questions similar to yours recommend running the following in an Ubuntu terminal in WSL:

sudo apt purge wslu

[Independently, consider upgrading from Sage 9.5 to a more recent Sage.]