GLIBCXX missing

You may see

OSError: /home/ubuntu/anaconda3/envs/tensorflow_p36/bin/../lib/libstdc++.so.6: version `GLIBCXX_3.4.20' not found

when starting ipython. For some reason this library isnt in the anaconda environments libstdc++.so.6. It is in the base ubuntu library. So link the anaconda version of this library back to the os version:

cd /home/ubuntu/anaconda3/envs/tensorflow_p36/lib
mv libstdc++.so.6 libstdc++.so.6.old
ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6 libstdc++.so.6