Play SIGIL on GNU/Linux: A new DOOM mod by the orginal creator John Romero
Checking to see if Spee.ch has your asset locally...
Check out Freedom Decrypted - a Freedom Slanted Tech Podcast for GNU/Linux users: https://freedomdecrypted.com/ The show is sponsored by ThinkPenguin.com - for your free software friendly hardware needs. Don't put up with garbage hardware from companies who don't want you to have freedom!
Documentation on downloading and installing SIGIL and the needed components is available from ThinkPenguin.com/support (just search the page for SIGIL) ... https://www.youtube.com/watch?v=0A0IkgEs5rk