This version only has the first episode, because the other 5 episodes require you to purchase the full game, and it would be illegal for me to distribute it.
Enable snaps on Kubuntu and install Wolfenstein 3D Shareware
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.