Bugs are tracked in LibreOffice Bugzilla.
Getting started with bug tracking in Launchpad.Ubuntu also tracks bugs for packages derived from this project: libabw in Ubuntu, libcdr in Ubuntu, libe-book in Ubuntu, libepubgen in Ubuntu, libetonyek in Ubuntu, libfreehand in Ubuntu, libmspub in Ubuntu, libmwaw in Ubuntu, libodfgen in Ubuntu, libpagemaker in Ubuntu, librevenge in Ubuntu, libstaroffice in Ubuntu, libvisio in Ubuntu, libwpg in Ubuntu, libwps in Ubuntu, libzmf in Ubuntu.