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I upgraded Ubuntu 12.10 to 13.04. And now after boot no login screen appears, instead the screen just shows a kind of static noise. However booting and logging in with the recovery mode works without any problem.

The PC is running with a Radeon Mobility 4570, Ubuntu displays VESA M92 as driver. I find it strange that I have no problems with the Live CD of Ubuntu 13.04, the issue only appeared after booting it from the HDD.

(In a related question somebody suggests to edit the unity-greeter.conf file, but it seems this file does not exist on my system.)

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Looks like a graphics driver issue to me. What's your graphics adapter and which driver does it use? –  David Foerster Sep 25 '13 at 8:46
    
The PC is running with a Radeon Mobility 4570, Ubuntu displays VESA M92 as driver. I find it strange that I have no problems with the Live CD of Ubuntu 13.04, the issue only appeared after booting it from the HDD. –  user2178205 Oct 2 '13 at 13:41
    
What happens, if you press Ctrl+Alt+F1 when the static appears? Do you see a login terminal? –  David Foerster Oct 2 '13 at 13:44
    
Can you install the debsums package and run debsums -s? –  Braiam Oct 3 '13 at 0:57
    
Ctrl+Alt+F1 causes no reaction. I installed debsums in the recovery mode. sudo debsums -s first showed the dialogue for installing/updating packages, after the update and reboot it exits without any message. –  user2178205 Oct 3 '13 at 14:35

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