check in your /usr/lib directory what version of libstdc++ you have.
you could have libstdc++.so.5.0.2 (or another version) but not ...so.5. If its the case, just make a link of that lib to the one you need.
ie:
ln -s /usr/lib/libstdc++.so.5.0.2 /usr/lib/libstdc++.so.5
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