How to install LibreOffice 4.4.x in Ubuntu?

Tried:

sudo add-apt-repository ppa:libreoffice/libreoffice-4-4

but cannot add PPA:

Cannot add PPA: 'ppa:~libreoffice/ubuntu/libreoffice-4-4'.
The team named '~libreoffice' has no PPA named 'ubuntu/libreoffice-4-4'

Libreoffice 4.4 was just released - the corresponding repository was created just some hours ago, it seems. As a result, the mentioned commands work now:

sudo add-apt-repository ppa:libreoffice/libreoffice-4-4
sudo apt-get update                                    
sudo apt-get dist-upgrade
[...]
The following packages will be upgraded:
  fonts-opensymbol libreoffice libreoffice-avmedia-backend-gstreamer libreoffice-base libreoffice-base-core libreoffice-base-drivers libreoffice-calc libreoffice-common libreoffice-core libreoffice-draw
  libreoffice-help-de libreoffice-impress libreoffice-java-common libreoffice-kde libreoffice-l10n-de libreoffice-math libreoffice-pdfimport libreoffice-report-builder-bin libreoffice-sdbc-firebird
  libreoffice-sdbc-hsqldb libreoffice-style-human libreoffice-style-oxygen libreoffice-writer python3-uno uno-libs3 ure

Please note, thought that right now the packages in the repo still carry the version tag rc3. It might take some more time until they are updated to the final version.

The "official" PPA for Libre-Office 4.4:

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

To add it:

sudo apt-add-repository ppa:libreoffice/libreoffice-4-4
sudo apt-get update
sudo apt-get upgrade

"et voilà"