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Possible Duplicate:
Ati incompatible with Gnome-shell?

my gnome-shell display screen is tilted/ skewed, how do I fix it? sometimes the screen flashes, how do I fix it? I've installed the ATI Catalyst 11.9

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marked as duplicate by Stefano Palazzo Nov 27 '11 at 14:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Possible duplicate: – Christopher Kyle Horton Nov 27 '11 at 4:50

You need to remove the fglrx drivers, at the moment (fglrx 11.9) do not work with GNOME Shell.

You need to access a terminal (press Ctrl+Alt+F1) or boot in to recovery mode (press Shift key right before Ubuntu is supposed to load and keep it pressed until the Grub menu comes up).

Login and run:

sudo sh /usr/share/ati/
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Follow this guide:

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Welcome to Ask Ubuntu! To avoid potential problems with linkrot, can you please edit the steps from the guide you have linked to back into your answer? As it stands now, your answer is little more than a link to an external site, which makes it subject to deletion. Thanks! – Christopher Kyle Horton Nov 27 '11 at 4:53

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