The LibreOffice extentions page says that the Wiki Publisher is included as a standard feature in 3.3. This was not true for me although I am running
LibreOffice 3.3.4 OOO330m19 (Build:401) tag libreoffice-188.8.131.52, Ubuntu package 1:3.3.4-0ubuntu1.
So, I installed the package
libreoffice-wiki-publisher from Synaptic (same thing you need to do in OpenOffice.org 3). I did this while Writer was running, so I had to restart it for the publishing option to appear (File | Send... | To MediaWiki...)
When I click on "To MediaWiki..." I get the following error:
The MediaWiki export filter cannot be found. Choose 'Tools-XML Filter Settings' to install the filter, or use the setup to install the component.
Is this a bug or is there something else I need to do?