How do I upgrade Git on Ubuntu?
If you want the latest git on your system, add this ppa in your software sources. Then install git-core if it wasn't done before, and update your system.
However I would suggest to upgrade to an unsupported package only if you require some specific features included only in the latest version.
sudo apt-get update sudo apt-get upgrade
If you already have it installed and everything is clean.
If you want the absolute newest version and that is not in the repositories, there is a guide to doing that here: http://ropiku.wordpress.com/2008/04/14/updating-git-on-ubuntu/
It's not the newest question, but I found myself asking the same and the only thing that worked was installing from the github repositories following the guide from the git book, which I guess is the most reliable when it comes to updates and changes anyway.