I just installed Ubuntu 15.04 few days back, and I installed possibly the most important software for it. But, I never works for some reason. I tried to reinstall Steam even that didn't work, now I try to launch steam from the Terminal I get this error message. 
thank you for trying to help.
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Neugdae
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This looks like a Driver issue open up Additional Drivers with this command:
/usr/bin/software-properties-gtk --open-tab=4
Install the one of the proprietary Drivers if that dose not work.
Install the Open Source Driver if that dose not work.
Install the recommended driver
Neil
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