[ubuntu] Switching between users from menu doesn't require password

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http://ubuntuforums.org – Since upgrading from Ubuntu 11.04 to 11.10, switching from one logged-in account to another by choosing a user from the list in the menu does not require a password. A password is required using any method that goes through the login window / greeter first, but not when switching directly to another account that is already logged in. I can imagine some people would consider the new behaviour to be a convenience feature, but for security/privacy reasons, I would prefer that a password always be required when switching to an account, especially the admin account. Can someone tell me how this b (Hardware)