$ sudo apt-get update
$ sudo apt-get install conkeror-spawn-process-helper 

conkeror-spawn-process-helper is installed in your system.

Make ensure the conkeror-spawn-process-helper package were installed using the commands given below,

$ sudo dpkg-query -l | grep conkeror-spawn-process-helper *

You will get with conkeror-spawn-process-helper package name, version, architecture and description in a table

conkeror-spawn-process-helper package basic information: