Comment 38 for bug 1210785

You shouldn't have to uninstall the packages only to reinstall them later, nor do you have to download the deb files manually as Mathieu providing a PPA.

The steps should just be as follows (in Terminal):
sudo add-apt-repository ppa:mathieu-tl/sru-staging
sudo apt-get update
sudo apt-get dist-upgrade
Reboot your system.