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I'm an absolute beginner with ubuntu. After installing 11.10 I get a message to install ATI proprietary driver. The new one can't be installed, the older one get installed. After installation I must reboot. I do so and my monitor shows me something like "70Hrz horizontal and 60Hrz vertical are not supported" on a black screen. I don't find a way to set other resolution like 1024x768 or 1280x1024 and I can't see something, even CPU seems to be working.

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I think it's related to the monitor not the card. – RobotHumans Apr 4 '12 at 19:59

From the above forums post, boot to recovery mode and run the following commands

apt-get remove --purge xorg-driver-fglrx fglrx-kernel-source
apt-get update
dpkg-reconfigure xserver-xorg

Reboot and X should work.

You can try to install the proprietary drivers, check to see if your card is supported first

Supported hardware :

Installation guide :

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you might want to look at this-

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Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. Imagine the linked site goes down for maintenance or forever - your answer would become worthless. – htorque Nov 5 '11 at 11:06

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