$ sudo apt-get update
$ sudo apt-get install elpa-simple-httpd 

elpa-simple-httpd is installed in your system.

Make ensure the elpa-simple-httpd package were installed using the commands given below,

$ sudo dpkg-query -l | grep elpa-simple-httpd *

You will get with elpa-simple-httpd package name, version, architecture and description in a table

elpa-simple-httpd package basic information: