Plesk should install ghostscript to display PDF thumbnails in WordPress
Without "ghostscript" package Wordpress(basic functionality) doesn't display PDF thumbnail for uploaded PDF files in Wordpress > media
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Ghostscript is not shipped with Plesk and can be installed separately from OS repository. For example, by executing from a command line:
- apt install ghostscript
Having Ghostscript package is the responsibility of the operating system, but not Plesk.
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IG