The Ghostscript application is available for the Ubuntu Linux operating system in the main software repository. Ghostscript is a command-line PDF and PostScript interpreter. PostScript is a method for creating a page bitmap from a set of graphics commands. You can use the Ghostscript software to view either file type or send a PostScript file to a non-PostScript printer. It can also be used to convert a PDF file to a PostScript file.
Right-click on the desktop and click on the "Open in Terminal" option to open a terminal window.
Type the command "sudo apt-get install ghostscript" to download and install the ghostscript package and all of the packages it depends on.
Type "Y" to confirm the installation process.
Type the command "exit" to close the terminal window.