Binary package “libgs9” in ubuntu bionic

interpreter for the PostScript language and for PDF - Library

 GPL Ghostscript is used for PostScript/PDF preview and printing.
 Usually as a back-end to a program such as ghostview, it can display
 PostScript and PDF documents in an X11 environment.
 This package provides the Ghostscript library which makes the
 facilities of GPL Ghostscript available to applications.