Checking out my logs, the most popular posts always seem to be those that outline how to install a package, extension or whatever. Installing git on ubuntu is really straight forward, but thought I'd post it anyway.
SSH into your box, and run the following:
sudo apt-get install -y git
sudo is used to mark that you have super-user permissions; apt-get is the
program that downloads binaries/programs; install command does what you think
it would; the -y flag tells the installer that you're answering yes to the
confirmation prompt about how much disk space it will require, and git is the
name of the program you're installing.
Boom.