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Possible Duplicate:
Xorg Segmentation Fault - seems to be relevant to evdev

So moving the cursor crashes unity back to the login screen. This happens even when controlling the cursor with a keyboard. Unity won't even start, unless in 2D. I've tried uninstalling ATI's drivers. No luck. This is some major suckage.

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marked as duplicate by Lekensteyn, Octavian Damiean, Takkat, Jorge Castro, fossfreedom Feb 5 '12 at 20:01

This question was marked as an exact duplicate of an existing question.

I solved it by removing Unity PPA.

    sudo apt-get install ppa-purge
    sudo ppa-purge ppa:unity-team/staging
    sudo ppa-purge ppa:unity-2d-team/unity-2d-daily
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