GLIBCXX_3.421 not found

./Wandere_bits: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by ./Wandere_bits)

./Wandere_bits: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by ./Wandere_bits)

위와 같은 오류가 발생한다면

sudo apt-get install libstdc++6

위와 같이 libstdc++6을 설치해준다. 이래도 안 된다면

sudo add-apt-repository ppa:ubuntu-toolchain-r/test 

sudo apt-get update

sudo apt-get upgrade

sudo apt-get dist-upgrade

끝.

출처 : http://askubuntu.com/questions/575505/glibcxx-3-4-20-not-found-how-to-fix-this-error