Calibre 2.28 recently released, is a free and open source e-book library management application developed by users of e-books for users of e-books. This latest release comes with a new feature which supports conversion of text styles, images, lists, tables, embedded fonts, etc. Produces DOCX files compatible with Microsoft Word 2007 or newer.
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Install by running the (One Line Command) via your systems Terminal below.
sudo -v && wget -nv -O- https://raw.githubusercontent.com/kovidgoyal/calibre/master/setup/linux-installer.py | sudo python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()"