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A few weeks back, I applied the latest updates to my Ubuntu 12.10 (32-bit) running Gnome-Shell, which happens to be a virtual machine running under VMware Player 5.0 on Windows 7. After the updates and a subsequent reboot, I didn't get the login screen. I could CTRL-ALT F1 to a text console, and I tried booting from the previous kernel, but no luck.

I discovered that if I disabled 3D acceleration in the VM settings, then the login screen would appear just fine. However, this isn't acceptable since the screen updates are just too slow.

I did a fresh install and after updating the same problem occurred. The same problem does not happen on 12.04 LTS. Not yet anyway.

I wrote a blog post describing the problem, and luckily someone left a comment that, although didn't directly fix my problem, helped me come up with a fix. Here's a link to my post:

The problem appears to be a bug in the 9.0.2 version of the mesa 3D drivers. 9.0.3 fixes the problem, and they are located in the proposed repository.

P.S. I would have written this in the existing question (Ubuntu 12.10 no login screen after update (vmware workstation 9)) but it was locked and I don't have the rating to unlock it.

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Seems like it might be a problem with lightdm. Try installing gdm as an alternative to see if lightdm is causing the problem. From your console at Ctrl+Alt+F1, run this command: sudo apt-get install gdm – Another Googler Mar 26 '13 at 23:15
Nope, switching to gdm didn't help. – Brian Mar 30 '13 at 21:56

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