n00bs on Ubuntu shows you how to install Gimp 2.7 on Ubuntu 11.10
You can install GIMP 2.7 on Ubuntu 11.10 using the matthaeus123 ppa for gimp. GIMP 2.7 is an unstable development version. A stable version (2.6) of GIMP can be installed from the Ubuntu Software Center. GIMP is the GNU Image Manipulation Program.Install Guide: Gimp 2.7 Using PPA On Ubuntu 11.10