calibre upstream requires interaction with the X display server for some parts of the conversion pipeline (e.g. image processing).
One of the major features of the 2.0 release and the port to Qt5, was the headless plugin on Linux, which allowed any of the command-line tools to work without Xorg running. This bug report is obsolete since Thu Aug 21 23:54:55 2014, with the 2.0.0 release. -- Eli Schwartz Arch Linux Bug Wrangler and Trusted User
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