Install gcc-5-multilib-i686-linux-gnu by entering the following commands in the terminal:
sudo apt update sudo apt install gcc-5-multilib-i686-linux-gnu
Description:
GNU C compiler (multilib support)
This is the GNU C compiler, a fairly portable optimizing compiler for C. . This is a dependency package, depending on development packages for the non-default multilib architecture(s).
Homepage: http://gcc.gnu.org/
Version: 5.5.0-12ubuntu1cross1
Section: universe/devel