libstdc++.so.6: version `GLIBCXX_3.4.20′ not found

July 15, 2023 by Tarik

Here’s a solution for this problem in Ubuntu 16.04

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9
sudo apt-get upgrade libstdc++6

You can check if you get GLIBCXX desired version like this:

strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep GLIBCXX