Comment 123 for bug 842566

For Natty enabling quick starter seems to have solved the problem completely. The catch is that in order to shut down the machine you would need to manually quit quickstarter, also have to configure with the dconf-editor to show the quick starter icon on the panel. Don't know if it works for later versions of Ubuntu.

LibreOffice 1:3.5.1-1ubuntu1~natty2 installed from the LO ppa https://launchpad.net/~libreoffice/+archive/ppa?field.series_filter=natty