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I own two laptops, and upgraded to Ubuntu 12.10 on both of them. On one of them, when I get to the login screen, I see a nice interface with the same background image as the desktop, and a nice transparent widget that asks me to choose a username to login.

However, on the other laptop, the b/g image is just gray and the login screen doesn't look as nice. The widget seems different too. Any possible reason this might be happening?

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Turns out that for some unknown reason, the default display manager was set to gdm instead of lightdm. Setting it back to lightdm worked for me! –  LightTreasure Oct 25 '12 at 8:45
You should post that as an answer if you solved the problem yourself! –  Mark Paskal Oct 25 '12 at 12:58
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