GIMP 2.7.1: Installation guide for Ubuntu
Gimp is my favorite image editor on Ubuntu. Gimp 2.7.1 is released and I wanted to try my hands on the same. Gimp 2.7 is non-stable version and is a mediator towards the much stable release which is Gimp 2.8. However, if you still want to try Gimp 2.7.1 on your Ubuntu machine you can install it using the following steps at your own risk.
Adding the PPA of Gimp 2.7 to the software sources list
The first step in the process is to get PPA added to your software sources list. Go to
System > Administration > Software Sources

Go the the tab that reads Third Party Softwares tab and add the following lines one by one:
deb http://ppa.launchpad.net/matthaeus123/mrw-gimp-svn/ubuntu jaunty main
deb-src http://ppa.launchpad.net/matthaeus123/mrw-gimp-svn/ubuntu jaunty main

Next up we have to add the GPG security key. You can get the key by going to Signing key page (At the end of the post) and copying the text and saving it by the name of Gimp on your desktop:

Now go the tab that reads Authentication on Software Sources window and import the GPG key file that you just saved on your desktop.

Installing Gimp 2.7
All that is left is to install Gimp 2.7. Drop to the terminal window by hitting ALT+F2 and typing “gnome-terminal” (with out quotes). Type the following command on your terminal window:
sudo apt-get update && sudo apt-get upgrade
Note: If you get the following error while installing running Gimp 2.7:

All you have to do is type the following code in your terminal
sudo apt-get install libgegl-0.0-0
Now you can start Gimp 2.7.1 by going to Applications > Graphics > GIMP Image editor

Signing key page
GIMP 2.7 Release Notes
http://gimp.org/release-notes/gimp-2.7.html
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