The libreoffice ppa have been update to the latest, and thus also fixing the global-menu to work. Here is the description from the Libreoffice ppa

LibreOffice test builds and backports

Note: For the current development release this ppa might even contain

alpha and beta releases!

There is a PPA dedicated to specific LibreOffice major series which

support a range of older Ubuntu releases too:

https://launchpad.net/~libreoffice/+archive/libreoffice-3-4

https://launchpad.net/~libreoffice/+archive/libreoffice-3-5

https://launchpad.net/~libreoffice/+archive/libreoffice-3-6

https://launchpad.net/~libreoffice/+archive/libreoffice-4-0

Most of the packages in this PPA have only experienced minor testing

-- in fact it is the place to enable a wider audience to test packages before they are published into the distro proper. In general, this PPA

is not for the average user to install without a closer look (if it
would be, its packages would be in the main repositories).

In general, users are advised to take a look at the changelog for the

details about a package. If there is a specific bug that is intended

to be addressed by an update released into the PPA, you are encouraged

to test, if the update solves that problem. Packages published after

the distro release are mostly such specific fixes. Critical fixes will

be SRUed into the main repositories after testing anyway (later, with

more testing).