I find a solution.
I used a lime survey service. I'm logged in and export the database.
I found on the file, the mysql table "permission" where there are a superuser setting.
From aruba phpAdmin I make a query
INSERT INTO `lime_permissions` (`id`,`entity`,`entity_id`,`uid`,`permission`,`create_p`,`read_p`,`update_p`,`delete_p`,`import_p`,`export_p`) VALUES
('1', 'global', '0', '1', 'superadmin', '0', '1', '0', '0', '0', '0');
My first user became super user
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