How can I update Unity to 5.16?

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http://askubuntu.com – I've got Ubuntu 12.04.1, but Unity is still in the 5.14 version. I have a problem with the launcher tooltips, but it got fixed in Unity 5.16. How can I update it? I've tried adding ppa:unity-team/ppa, ppa:unity-team/stagging and ppa:ubuntu-desktop/ppa, but nothing worked. Please, I hope you can help me! The bug is: https://bugs.launchpad.net/unity/+bug/1034164 Here's something I found about Unity 5.16, but I don't know how launchpad works so much, but if i'm not wrong I think there's some way to install it: https://launchpad.net/ubuntu/+source/unity/5.16.0-0ubuntu1 I tried enabling the purp (HowTos)