Bug 247479

In version 6.4.4 built locally PDF exported from Writer documents contain no fonts, only random symbols. The same behaviour observed in version 6.4.4.2 installed from officially built packages (separate installation for testing purposes).

The same about printing to file (PDF).

On the other hand, printing to file from Firefox on the same system works fine.

Tested under CURRENT.
Libreoffice build summary:
Options        :
	CUPS           : on
	DOCS           : on
	GNOME          : off
	GTK3           : off
	JAVA           : off
	KF5            : off
	MMEDIA         : on
	PGSQL          : off
	QT5            : on
	SDK            : off
	TEST           : off
	WEBDAV         : on
Shared Libs required:
	libjpeg.so.8
	libfreetype.so.6
	libfreehand-0.1.so.1
	libOsi.so.1
	libe-book-0.1.so.1
	libSM.so.6
	liblpsolve55.so
	libepubgen-0.1.so.1
	libCoinMP.so.1
	libpoppler.so.100
	libxmlsec1.so.1
	libnss3.so
	libclucene-core.so.1
	librevenge-0.0.so.0
	libglib-2.0.so.0
	libXrender.so.1
	libQt5X11Extras.so.5
	libicuuc.so.67
	libboost_iostreams.so.1.72.0
	libboost_filesystem.so.1.72.0
	libClp.so.1
	libQt5Network.so.5
	libintl.so.8
	libhunspell-1.7.so.0
	libXrandr.so.2
	liborcus-0.15.so.0
	libicui18n.so.67
	libXinerama.so.1
	liblcms2.so.2
	libneon.so.27
	libXext.so.6
	libcairo.so.2
	libICE.so.6
	libxml2.so.2
	libQt5Widgets.so.5
	libstaroffice-0.0.so.0
	libClpSolver.so.1
	libxcb.so.1
	liblber-2.4.so.2
	libltdl.so.7
	libX11.so.6
	libclucene-shared.so.1
	libgobject-2.0.so.0
	libcdr-0.1.so.1
	libCgl.so.1
	libclucene-contribs-lib.so.1
	libpng16.so.16
	libgstbase-1.0.so.0
	libraptor2.so.0
	libmspub-0.1.so.1
	libfontconfig.so.1
	libCbcSolver.so.3
	libexpat.so.1
	libxslt.so.1
	libwpd-0.10.so.10
	libepoxy.so.0
	libCbc.so.3
	libcups.so.2
	libCoinUtils.so.3
	libpagemaker-0.0.so.0
	libplc4.so
	libzmf-0.0.so.0
	libharfbuzz-icu.so.0
	libexttextcat-2.0.so.0
	libboost_locale.so.1.72.0
	libboost_date_time.so.1.72.0
	libnssutil3.so
	libodfgen-0.1.so.1
	libvisio-0.1.so.1
	libqrcodegencpp.so.1
	libharfbuzz.so.0
	libgstvideo-1.0.so.0
	libgraphite2.so.3
	libmythes-1.2.so.0
	libgstaudio-1.0.so.0
	libhyphen.so.0
	libabw-0.1.so.1
	libsmime3.so
	libxmlsec1-nss.so.1
	libetonyek-0.1.so.1
	libpython3.7m.so.1.0
	libwpg-0.3.so.3
	librevenge-stream-0.0.so.0
	libcurl.so.4
	libqxp-0.0.so.0
	libQt5Gui.so.5
	libnumbertext-1.0.so.0
	libwps-0.4.so.4
	libldap-2.4.so.2
	libgstreamer-1.0.so.0
	librdf.so.0
	libssl3.so
	libnspr4.so
	libmwaw-0.3.so.3
	libQt5Core.so.5
	liblangtag.so.1
	libplds4.so
	libexslt.so.0
	libmysqlclient.so.20
	libgstpbutils-1.0.so.0
	libOsiClp.so.1
	libcmis-0.5.so.5
	liborcus-parser-0.15.so.0
	libxcb-icccm.so.4
Shared Libs provided:
	libuno_cppu.so.3
	libuno_purpenvhelpergcc3.so.3
	libuno_salhelpergcc3.so.3
	libuno_cppuhelpergcc3.so.3
	libuno_sal.so.3

(Im)possible workaround: Changing default printing method to PS (Tools > Print > uncheck the box for PDF as default printing method) and print to PS file, then convert to PDF using pdf2ps. That works fine.
So, only PDF printing doesn't work. At that, images, tables and graphical objects are inserted in PDF all right. Only text is missing.