An application sends a PDF file to CUPS when 'print' has been selected (in case the application sends another format, it is converted to PDF first).It is important to know how CUPS works if wanting to solve related issues: Then, whenever a program attempts to connect to one of these CUPS sockets, systemd will start rvice and transparently hand over control of these ports to the CUPS process. If cups.socket is enabled (and rvice is disabled), systemd will not start CUPS immediately it will just listen to the appropriate sockets. Then enable and start rvice or alternatively use socket activation to only start CUPS when a program wants to use the service.Ĭups provides a cups.socket unit. The location can be changed in /etc/cups/nf. By default, PDF files are stored in /var/spool/cups-pdf/ username/. Optionally, install the cups-pdf package if you intend to "print" into a PDF document. The package is needed because IPP Everywhere sends a PDF directly to the printer, therefore cups-pdf is needed to convert everything you want to print to a PDF first. Without this package you may see an error like: client-error-document-format-not-supported. Note: As drivers are deprecated in CUPS in favor of IPP Everywhere you may need to install cups-pdf to get printing to work.
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