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[Pedric <pedric@xxxxxxxxxxxxxxx>]

I found that you don't need uninstall fglrx (or nvidia, as that driver
will ship its own libGL as well) to use mesa libGL again - you can use

sudo update-alternative --set gl_conf /path/to/ld.so.conf

To see the available GL configurations, run

update-alternatives --list gl_conf

For example, if you run one of the open source drivers such as intel,
radeon or nouveau, update the gl configuration alternative to the mesa
configuration.

sudo update-alternative --set gl_conf/usr/lib/mesa/ld.so.conf

Or, if you run fglrx run

sudo update-alternative --set gl_conf /usr/lib/fglrx/ld.so.conf

Nvidia ships its own GL configuration alternative, which works the same.
After doing so, you need to run

sudo ldconfig

to reconfigure the dynamic linker run-time bindings. It may be better to
do so when X is not running, as e.g. fglrx will crash if you switch to
mesa while it is running.

-- 
glxinfo crashed with SIGSEGV in XF86DRIQueryExtension()
https://bugs.launchpad.net/bugs/555158
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