Install g++-multilib by entering the following commands in the terminal:
sudo apt update sudo apt install g++-multilib
Description:
GNU C++ compiler (multilib files)
This is the GNU C++ compiler, a fairly portable optimizing compiler for C++. . A dependency package on architectures with multilib support; the package contains dependencies for the non-default multilib architecture(s).
Version: 4:7.3.0-3ubuntu2
Section: devel