Ｖ字龍 (Vdragon) says to Ubuntu 台灣社群"By default, logged-in users in active log-in sessions are permitted to perform operations (for example, mounting, unlocking or modifying) on devices attached to the seat their session is on. Access-control is fine-grained and based on polkit(8), see the “Authorization Checks” chapter in the udisks documentation for more information." https://udisks.freedesktop.org/docs/latest/udisks.8.htmlat Wed, Feb 15, 2017 10:26 PM