Using apt-get install

Use the below command on your ubuntu terminal:

$ sudo apt-get install git

Installation from source code

But at times you want to install a particular version of GIT for reasons. Follow the below to do that:

sudo apt-get install libcurl4-openssl-dev build-essential autoconf
git clone https://github.com/git/git
cd git
git checkout v2.1.2
make configure
./configure with-openssl
make prefix=/usr/local all
sudo make prefix=/usr/local install

** Errors You May Find During Installation:
* tclsh failed; using unoptimized loading
MSGFMT    po/de.msg make[1]: *** [po/de.msg] Error 127
make: *** [all] Error 2

Solution:
sudo apt-get install gettext

The above steps will install git version 2.1.2 in your system.