I'm always surprised to see people still suggesting phpBB. I thought it was fairly common knowledge by now that it is or has been riddled with security flaws. In addition, it's certainly not as streamlined as other forum software.
If Refracta, or Devuan for that matter, convert to a different forum, I recommend FluxBB. I've administered is in the past and it very fast. I'm not particularly fond of PHP in general but FluxBB lovely piece of kit.