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I am running Ubuntu 11.04 64bit with a ATI RadeonHD 5750/5770 (JUNIPER), 4GB ram. When I get to the login screen, all I see is a flickering white box instead of the login dialog.

The background displays fine. My hunch is that this problem is not related to the video driver, since I've reinstalled xserver-xorg-video-radeon and deinstalled fglrx.

I deleted the xorg.conf and tried different configurations, all with the same result. This only occurred after a recent update - though I don't know which packages got update. Any ideas?

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closed as too localized by jrg Feb 26 '12 at 21:22

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.

You can check out files /var/log/apt/history.log and /var/log/aptitude on what files you recently installed, upgraded or removed. I suggest you do that and then tell us, what packages changed. It may be a bug, so you may need to send a bug-report to maintainers of the package. –  Mirzhan Irkegulov Feb 25 '12 at 14:11

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