Comment 18 for bug 1405349

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Robert Ancell (robert-ancell) wrote :

More investigation shows that this is actually a Unity bug. The black screen you are seeing is the lock screen but Unity doesn't have a lock screen when in guest mode. The lock screen is triggered when you switch users via the indicator.

You can also trigger this by typing alt+ctrl+L inside the guest session. It will show a black screen that disappears when you move the mouse.

The solution should be that Unity does nothing when the lock screen is requested to be activated.