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I just updated my Ubuntu 11.04, but now when starting it a black screen is shown and prints:

Checking battery state

Stopping system v runlevel compatibility

I tried to install the latest proprietary ATI driver but the error remains

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I have the same problem on one of my ubuntu installs. (also ati drivers) I'll keep watch on this and let you know if I fix it. But I am thinking about just moving to archlinux. – user606723 Jul 20 '11 at 17:41
up vote 2 down vote accepted

Try to start in recovery mode. Select recovery mode, press e and add nomodeset to the line where you will probably find quit splash. Once your system is started, remove your latest ati-driver installation.

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