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Fatal error during installation [Solved]

WorkflowSupport request
StatusImmediate solution has been provided
This is a completely clean, new installation. First configuration screen results okay, but the next button leads to this error:

Fatal error: Cannot redeclare class Drupal in /services/xml_rpc_drupal.login_hook.php on line 35

If I return to the root directory, I see the basic root page; but if I attempt to go to the control panel, it gives a page saying "please configure software extensions." The link given is for /control/scan.php. Following that link results in the same error.

Looks like someone else ran into this (see Bogue des mises à jour résolu ! [résolu]) but I can't figure out if they solved it or not - my knowledge of French ends at "zut alors!"