$ sudo apt-get update
$ sudo apt-get install gnumach-image-1-486 

gnumach-image-1-486 is installed in your system.

Make ensure the gnumach-image-1-486 package were installed using the commands given below,

$ sudo dpkg-query -l | grep gnumach-image-1-486 *

You will get with gnumach-image-1-486 package name, version, architecture and description in a table

gnumach-image-1-486 package basic information: