Eaglercraft 1.21.4 Server by Ryan Norshare !
Step 1: Installing some stuff :D in a new terminal tyoe sudo apt install default-jdk && sudo apt install default-jre -y

Step 2: Open two new terminals type cd server && sudo java -jar server.jar in the first and in the second type cd bungee && sudo java -jar bungee.jar

Step 3: Forward Ports 8081 and 25565 and make port 8081 Public and the link next to it is your server ip

Step 4: replace "https://" with "wss://"

Step 5 (Optional): to add plugins go to server>plugins and upload them there and then restart your server with stop then sudo java -jar server.jar


Note: Remember this server is free and so it is not going to be online 24/7 or lag free so i recommend installing the plugin "Clear Lag" which automatically clears entitys