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So, I have this problem, LightDM doesn't appear, after Ubuntu 12.04 loads, it shows a black screen with a white bar on the command line. I know the problem is LightDM, because last time I used Ubuntu on my laptop, I closed the lid and reopened, and the lock screen did not appear...

What is wrong? Do I have to reinstall LightDM? I don't care if I have to install gDM, as long as I can change the desktop environement, I'm alright with gDM...

How can I repair LightDM?

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Provide details on hardware. This is likely a graphics chipset/card issue. –  david6 Jun 21 '13 at 20:33

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