Libre Base works great in standard ubuntu 15.04 However a fresh installation on a Lubuntu 15.4 both via synaptic and again terminal failed to install the full base package ie. sudo apt-get install libreoffice and aptitude install libreoffice Mainly Report builder and also other packages not included I do not know what other packages are still missing as base is still broken Lubuntu installs via Synaptic version 4.4.2.2 I also tested Version 4.4.5 Version 5 is missing a lot more than just the report builder
The Ubuntu packaging is maintained by Ubuntu. You should report the bug at https://bugs.launchpad.net instead.