I am trying to start up a server on my Ubuntu(Linux) laptop, using Spigot. I already ran Buildcraft, and moved on to installing and running Spigot. I have also extracted the spigot executable, in another folder.

Then, following instructions, I created a script file(.sh) inside of the spigot file(which was created by running the spigot executable), and moved on to the next step, where I opened a terminal and input the command chmod +x start.sh.