ImportError: /lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found

I totally agree with the accepted answer from @wasi-ahmad.

More specifically, typing

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/wasiahmad/software/anaconda3/lib/

in the terminal will solve the problem

Adding /home/wasiahmad/software/anaconda3/lib/ to the LD_LIBRARY_PATH solved the problem. Thanks to Knud Larsen for his comment and the reminder that /lib64/libstdc++.so.6 currently comes first in LD_LIBRARY_PATH.