Check that the Fluid Topics PDF Server daemon is running by using the following command:
As root user
systemctl status fluidtopics-pdf-server
The following result is expected:
● fluidtopics-pdf-server.service - Fluid Topics Pdf Server
...
Active: active (running) since mar. 2018-11-13 14:11:06 UTC; 496ms ago
...
The PID number is randomly assigned to an operation and does not have to match the documentation.
If the Fluid Topics PDF server is not running, use the following command:
As root user
systemctl start fluidtopics-pdf-server