Mysql error at fresh install of librenms

Hi there,
Just downloaded and installed ubuntu 16.04 on a real pc, not a vm.
Now, I´m following the librenms install guide

But I´m stuck at configuring the db server. Once i enter ¨
systemctl restart mysql¨, It shows this error:

It seems there is no mysql server running or a wrong socket.
Is this possible with a fresh installation ?

You need to fix your mysql server, which is a little out of scope here. Check to make sure you aren’t out of disk space.

Thank you for the quick reply ))
I´ll look up at a database forum for this issue.