$ sudo apt-get update
$ sudo apt-get install gobjc-multilib 

gobjc-multilib is installed in your system.

Make ensure the gobjc-multilib package were installed using the commands given below,

$ sudo dpkg-query -l | grep gobjc-multilib *

You will get with gobjc-multilib package name, version, architecture and description in a table

gobjc-multilib package basic information: