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I'm in ubuntu 12.04 using two monitors.

In the login screen in one monitor I have the purple background with the usernames list and the password text field. In the second monitor I have a version of the purple wallpaper with the ubuntu logo in white in the center, anyone knows where can I find this image?

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up vote 3 down vote accepted

The images are stored in usr/share/ backgrounds

If you want to change these images you just need to change your desktop wallpaper. This will also set the back ground of the login screen (LightDM) to be the same.

Instructions how to change the wallpaper in LightDM

Instructions how to configure LightDM

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