influx setup

"Hello, when executing influx setup on Ubuntu, it keeps showing a 401 Unauthorized error."

Start by reproducing `influx setup` on Ubuntu and capture the request or setup step that returns 401 Unauthorized. Trace the setup authentication flow to identify whether the failure is reproducible; done when the cause is isolated and the setup command succeeds or the required fix is clearly documented.

Written by the indexing model from the issue text.