Case 1: lib can not find a required lib (e.g. libstdc++, included in libgcc), both lib in conda
ImportError: /home/diego/anaconda3/lib/python3.5/site-packages/matplotlib/../../../libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /home/diego/anaconda3/lib/python3.5/site-packages/matplotlib/_path.cpython-35m-x86_64-linux-gnu.so)
It seems that a newer version of gcc is required, in particular one that contains CXXABI_1.3.9
After some reading, there are two possible solutions:
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One for the people without anaconda, which is somehow explained here.
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In my case I use Anaconda, and the problem is solved with
conda install libgcc, which upgrades the current gcc compiler.
More info about this can be found here
Case 2: lib can not find a required lib (e.g. libstdc++), the required lib not in conda
ImportError: /lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /home/wasiahmad/software/anaconda3/lib/python3.6/site-packages/matplotlib/_path.cpython-36m-x86_64-linux-gnu.so)
add conda lib's path to LD_LIBRARY_PATH
add /home/username/software/anaconda3/lib/ in the LD_LIBRARY_PATH ... Be aware that /lib64/libstdc++.so.6 currently comes first in "LD_LIBRARY_PATH"
From: