UE4 4.25 Linux -- Ubuntu 20.04 ok. Fedora or Centos 8 complains about Vulkan

Since there was no reply to this question previously, I presume there was an unresolvable problem wrt Fedora . . I am a potential newbie and have asked another question before I even get started - but if there is positive feedback from that question, I would still need to be able to get UE running on Fedora . .