There are lots of things that could be wrong.  To confirm that the X11/OpenGL GLX extension is missing, run the glxinfo program from the mesa-utils package (if you need to install mesa-utils, installing the associated dependencies might solve your problem) -- it should fail.  Next examine /var/log/Xorg.0.log to see the error the X11 server has loading  the GLX extension.  Fix that error, restart the X11 server, and repeat until the glxinfo program works.  Then Chimera should work too.

Last bit of advice, a simple thing to try is to (re)install the graphics driver.  If you have AMD/ATI or NVIDIA graphics, we strongly recommend that you install the proprietary driver that is installed with the Additional Drivers tool in the System Settings dialog.  If you have Intel graphics and glxinfo works, but Chimera doesn't, then make sure you have all the Ubuntu patches installed.  But even if you keep your system up-to-date, if you have Intel graphics, you should switch to newer versions of Ubuntu when they come out -- for instance, today, you should upgrade to 12.10, and I'd recommend 13.04 when it comes out, ad infinitum or at least for the next 5 years, until the Intel graphics driver is much less buggy (it has drastically improved in the last couple of years, but there is much more being done).

    HTH,

    Greg
 
On 11/06/2012 12:26 PM, sette@uniroma2.it wrote:

Dear all,

in Ubuntu 12.04, 32 bit, I have the following error message when starting Chimera 1.6.2:

"Error initializing OpenGL: X server is missing OpenGL GLX extension. Couldn't configure togl widget".

Do you know a solution for this problem?

Thanks,
Marco


Dr.Marco Sette, Ph.D.

Department of Chemical Sciences and Technology
University of Rome, "Tor Vergata"
via della Ricerca Scientifica, 00133, Rome, Italy
e-mail:        sette@uniroma2.it
e-mail:        m77it@yahoo.it
Tel.:          +39-0672594424
Fax:           +39-0672594328

www.rete29aprile.it


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