libstdc++.so.6: version `GLIBCXX_3.4.21' not found 问题解决

我在安装vn.py时报以下错误：python andy@andy:~/vnpy/examples/VnTrader$ python run.py Traceback (most recent call last): File "run.py", line 19, in <module> from vnpy.trader.gateway import (ctpGateway, oand

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