Upgrade (and keep synced with system update) git version on ubuntu 12.04

My git version was 1.7.9.5, while the latest version is 1.8.5.2, wanted to upgrade it to use the --diff-dir option available from version 1.7.11.

Tried the way of download source code and build locally (https://www.digitalocean.com/community/articles/how-to-install-git-on-ubuntu-12-04), not working for me.

Finally, found this page:

https://launchpad.net/~git-core/+archive/ppa

and steps are:

1. add git ppa

$sudo add-apt-repository ppa:git-core/ppa

2. update

$sudo apt-get update

3. upgrade git

$sudo apt-get install git

Check version with command

$git --version

git version 1.8.5.2

Yeah~