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I'm using Unity on Ubuntu 12.04. My lock screen has always been white. It was also white when I used Gnome 3. If I move the mouse, click, or begin typing my password, my wallpaper appears in the background with the password prompt window, as you'd expect. But I know that the lock screen is not intended to work this way. The Unity Greeter, the Lightdm session manager, is supposed to operate the lock screen.

It's supposed to look like this image here: http://cloudfront.omgubuntu.co.uk/wp-content/uploads/2012/02/new-lightdm-lockscreen-500x351.jpg

How do I fix this? I can't seem to find anyone else with this problem and I don't know what I need to reinstall or change.

The current answer, that it's not a screensaver, is wrong. The white screen is unacceptable and is not Unity's intended behavior.

Thanks.

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It's a Lock screen not a screen saver, seems normal to me. – Uri Herrera Sep 27 '12 at 21:31
It's not normal at all. See this image (cloudfront.omgubuntu.co.uk/wp-content/uploads/2012/02/…) from this article (omgubuntu.co.uk/2012/02/a-handful-of-minor-ubuntu-12-04-updates). That is how the lock screen is intended to behave in Ubuntu 12. – kedmond Dec 21 '12 at 18:06
I have been getting the "white" lock screen as long as I can remember (now in 12.10). Unless you click switch user, you don't get the lightDM screen. The article you refer to was written before the final release. It is possible this appearance was not implemented. – user68186 Dec 21 '12 at 18:23
I've been reading in some bug reports that the white lock screen is a bug. It's a failure of gnome-screensaver to switch lock screen handling to Lightdm Session Manager. Also, the bug crops up when using NVidia binary drivers. – kedmond Dec 21 '12 at 18:30
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Did you try to install another display manager (such as gdm)? This will not solve the problem, but at least compensate it. – Alex Dec 21 '12 at 19:54
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