Cannot Install server on ubuntu 18.04

I have read the following documentation

Installed it all but nothing seems to be running or working at all.
Have I missed something. I really would like to get this up and running as soon as. because I am currently using excel and its a nightmare.

All help is greatly appreachiated.
P.S I do not know many linux commands, i am rather lost when it comes to linux.

Kind Regards,
Jordan Milne