The high-fidelity document preview feature requires the installation of LibreOffice or the LibreOffice-headless package, depending on the operating system you are running.
If LibreOffice is installed, the system is automatically configured to use high-fidelity document preview. If LibreOffice is not installed, the preview engine from prior {product-name} releases is used.
This can be accomplished with the appropriate Linux distribution’s package management systems:
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For RHEL, install the libreoffice-headless package:
yum install libreoffice yum install libreoffice-headless
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For Ubuntu, install libreoffice:
apt-get install libreoffice
Confirm you have the appropriate language packs or fonts installed for LibreOffice to properly view documents and attachments. For example:
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If using Ubuntu 12.04 (deprecated) and viewing East Asian languages, be sure to install:
apt-get install libreoffice-l10n-* apt-get install ttf-vlgothic
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If using Ubuntu 14.04 or 16.04 and viewing East Asian languages, be sure to install:
apt-get install libreoffice-l10n-* apt-get install fonts-vlgothic
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If using RHEL, be sure to install:
yum install libreoffice-langpack-xx