Solution to the following STEAM error:
libGL error: unable to load driver: r600_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: r600
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
Solution
find $HOME/.steam/root/ubuntu12_32/steam-runtime/*/usr/lib/ -name „libstdc++.so.6“ -exec mv „{}“ „{}.bak“ \; -print