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1.) Add the Maverick partner repository:
Software Center -> Edit Menu -> Software Sources -> Other sources -> Add:
deb http://archive.canonical.com/ubuntu maverick partner
2.) Drop to a command prompt:
sudo apt-get update
sudo apt-get install sun-java6-jre sun-java6-plugin
sudo update-alternatives --config java
If the last option prompts you to set a specific java configuration, ensure you select the Sun variant.
3.) Install Zotero plugin from http://www.zotero.org/
4.) Install the outdated OpenOffice plugin, not the most recent one: http://www.zotero.org/download/integration/Zotero-OpenOffice-Plugin-3.1b1.xpi
5.) After Firefox has restarted go to Zotero -> Preferences -> Cite tab.
In here, change the OpenOffice parameters to the following:
soffice binary: file:///usr/lib/libreoffice/program/
6.) Click "install plugin".
If this fails, go into LibreOffice, Tools menu -> Extension manager -> Add
Navigate to your firefox profile directory which will look like:
and manually add the .oxt file from within.
With any luck, you should be set. Worth also checking in LibreOffice -> Edit menu -> Preferences -> Java that you are using the Sun interpreter in LibreOffice.