Install gobjc-multilib by entering the following commands in the terminal:
sudo apt update sudo apt install gobjc-multilib
Description:
GNU Objective-C compiler (multilib files)
This is the GNU Objective-C compiler, which compiles Objective-C on platforms supported by the gcc compiler. . 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: universe/devel