git v18.104.22.168 is available for Ubuntu 13.04 (Raring) in my git PPA. When Ubuntu 13.04 was released on April 25, 2013 they shipped it with git v22.214.171.124 and git v1.8.2.x has been out for a while.
git v126.96.36.199 was released on April 26, 2013 and I personally have been using git v1.8.2.x for a while now on Ubuntu 12.10. As I upgraded my machine to Ubuntu 13.04, I just had to create a package for Ubuntu 13.04 as well.
Currently git v188.8.131.52 is available in my repository for Ubuntu 13.04, 12.10 12.04, 11.10 and 10.04. I have dropped support for Ubuntu 11.04 and 10.10.
To use my repository follow these instructions.