I'm guessing you're at the part in the guide where you're trying to symlink Ignition into init.d? All services have a script file stored in the directory init.d.
If you're newer to linux, I'd suggest reinstalling linux to a base install and doing the following:
then add these lines to the end of the file:
deb http://archive.inductiveautomation.com/apt ignition non-free
deb http://archive.inductiveautomation.com/apt ignition-beta non-freefinally, do the actual install
sudo apt-get update
sudo apt-get install ignition