Comment 46 for bug 907675

Comments 29-35 sort of explain it, but it's a bit buried in the bug metadata spam. At this point I'm assuming that upgrading Ubuntu 18.04 to OpenSSL 1.1.1b or newer isn't viable or it would have been done already. Therefore, what we currently need is to add a fallback mechanism to Twisted allowing it to support Ed25519 keys using PyNaCl or similar if a sufficient version of OpenSSL isn't installed. I started on this a while back but haven't finished it yet.