Anaconda libstdc++.so.6: version `GLIBCXX_3.4.20' not found
A solution that worked for me was:
conda install -c anaconda libstdcxx-ng
I meet the same problem, which is when I run jupyter notebook, I got
ImportError: /home/cugtyt/software/miniconda3/lib/python3.6/site-packages/zmq/backend/cython/../../../../.././libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by /home/cugtyt/software/miniconda3/lib/python3.6/site-packages/zmq/backend/cython/../../../../../libzmq.so.5)
I solve it by doing this:
conda uninstall gcc
Hope it can help u!