$ sudo apt-get update
$ sudo apt-get install doom-wad-shareware 

doom-wad-shareware is installed in your system.

Make ensure the doom-wad-shareware package were installed using the commands given below,

$ sudo dpkg-query -l | grep doom-wad-shareware *

You will get with doom-wad-shareware package name, version, architecture and description in a table

doom-wad-shareware package basic information: