AndreEnderMC
I followed the guide and got the server to start, but whenever I try to join it it says: Authentication Servers are down for maintenance. (This usually only happens when mojang’s servers are down) I found this weird because I could still connect to 5 different servers which meant I was the one with the problem. I also got my friend to try to connect and he said that the authentication server failing was also displayed on his screen. I have been able to get a server to work successfully in Kubuntu 17.04 and 17.10 but with 18.04 I am encountering this problem.
What I have found to allow me to access it is to set online-mode=false in server.properties; however, this does allow me to join but not my friend, and this leaves the server open for access by “pirate” versions of Minecraft according to what I have read as well as failing to load in player skins. Since 18.04 has been released recently I am not able to find information online to help, so I came here hoping I can find a response.