$ sudo apt-get update
$ sudo apt-get install libmlx4-1 

libmlx4-1 is installed in your system.

Make ensure the libmlx4-1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libmlx4-1 *

You will get with libmlx4-1 package name, version, architecture and description in a table

libmlx4-1 package basic information: